WO2009007927A1 - Procédé d'éclairage d'au moins une partie d'un espace et système d'éclairage destiné à être utilisé dans ce procédé - Google Patents

Procédé d'éclairage d'au moins une partie d'un espace et système d'éclairage destiné à être utilisé dans ce procédé Download PDF

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Publication number
WO2009007927A1
WO2009007927A1 PCT/IB2008/052776 IB2008052776W WO2009007927A1 WO 2009007927 A1 WO2009007927 A1 WO 2009007927A1 IB 2008052776 W IB2008052776 W IB 2008052776W WO 2009007927 A1 WO2009007927 A1 WO 2009007927A1
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WO
WIPO (PCT)
Prior art keywords
light
reflective
light source
cone
reflective surface
Prior art date
Application number
PCT/IB2008/052776
Other languages
English (en)
Inventor
Marcus J. H. Kessels
Joseph F. R. Eijsermans
Leonie M. Geerdinck
Henriette J. Talen-Van Der Mheen
Theodorus L. G. M. Thijssen
Abdelhafid El Bouhali
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2009007927A1 publication Critical patent/WO2009007927A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures

Definitions

  • the present invention relates to a method of illuminating at least part of a space, such as an office, and a lighting system for use in such a method.
  • Office lighting is known in a lot of variants.
  • WO2005124290 describes a method of, and a system for, indirectly illuminating an open interior space, such as an open office, which method includes using individual lighting fixture modules, each comprised of at least one linear indirect fluorescent lighting fixture element and preferably a pair of side-by- side parallel linear indirect fluorescent lighting fixture elements, suspended at fixed grid pattern locations beneath the ceiling of the open interior space.
  • Each of the linear indirect lighting fixture elements of the fixture module is preferably not larger than approximately six feet in length, with a suitable length being somewhat in excess of four feet, in which case a four foot lamp is used.
  • each is suspended below the ceiling at its fixed grid location by a suitable hanger structure that maintains a spacing between the fixture elements that jointly form a preferred overall fixture module with a length of approximately four feet.
  • the indirect fixture modules are especially well adapted to be suspended below a grid ceiling having square or rectangular ceiling grids for supporting square or rectangular ceiling tiles, however, they can be suspended below other ceiling structures as well.
  • US4454569 discloses a lighting fixture which is primarily adapted for removable attachment to modular office furniture and for adjustable, substantially glare-free illumination of a work surface.
  • the lighting fixture has a substantially elongated housing for a ballast, and a pair of holders for fluorescent tubes which are pivotably attached to a lower surface of the housing.
  • a fastening device is attached to the housing, which enables removable attachment of the lighting fixture to the underside of a shelf or the like, preferably without physically altering or changing the shelf.
  • a channel-shaped member having an upwardly open face is attached to and disposed substantially along the entire length of the housing in order to unobtrusively accommodate at least a portion of a cable which connects the lighting fixture with an electric outlet.
  • a user may adjust the positioning of each tube holder relative to the housing in order to obtain an optimal lighting effect on the work surface.
  • Offices are often built in a modular way. First, a larger unit is equipped with the electric infrastructure for lighting. In this construction step, the positions for ceiling lamps in the larger unit (and thus also the later offices) are determined. In view of the luminance and glare requirements for office lighting, often a relative large amount of luminaries are arranged in the larger unit. Then, the larger unit is subdivided into smaller units (offices) by placing walls in the larger unit, and thereby offices are created.
  • a disadvantage of prior art systems is that costly electric infrastructure for lighting is to be implemented in the larger unit, while the larger unit is not yet subdivided into offices. This in general leads to the solution whereby more luminaries than necessary are arranged in the larger unit, in order to still allow a flexible positioning of the walls. Not only is this a costly method in view of the electric infrastructure for lighting, it is also a waste of energy since more luminaries than necessary are applied.
  • a method of illuminating at least part of a space comprising: providing in the space a lighting system, the lighting system comprising a light source suitable for generating a substantially horizontal beam of light which is substantially parallel, and a reflective object, comprising a reflective surface, at a distance > 0.5 m from the light source, the method further comprising generating the beam of light and irradiating the reflective surface with the beam of light, wherein the reflective object is arranged to reflect and expand the beam of light into a reflected expanded beam of light having a cut-off angle equal to or smaller than 65° relative to a normal to a substantially horizontal surface in the space.
  • a method wherein a normal to the reflective surface of the reflective object is within a virtual cone having a cone axis and a cone angle, wherein the cone axis is within a vertical plane which is parallel to the beam of light and which comprises at least part of the beam of light, and the cone axis includes an angle ⁇ with the beam, wherein the cone angle is equal to or smaller than 32.5° and wherein ⁇ is equal to 45 ⁇ 5°.
  • the cone angle may be equal to or smaller than about 20° and the cut-off angle may be equal to or smaller than 40°.
  • the angle ⁇ included by the cone axis and the beam is, in a specific embodiment, 45°.
  • An advantage of this method is that one may arrange the reflective object at any position in the space, especially above a desk or other work area in for instance an office, while the electric infrastructure for lighting is relatively limited, i.e. a limited number of light sources may be arranged at dedicated positions, for instance at or in walls or attached to or integrated in ceilings, especially close to ceilings, which then illuminate the reflective surface of the reflective object.
  • the light source and the reflective object of the lighting system of the invention are not one integrated unit, but consist of two units: the light source and the reflective object, which can be arranged at different position in a space, such as an office.
  • the reflective object and the light source are separate entities which are not attached to each other. They can be arranged at a distance in the range of 1-100 m, especially in the range of 1.5-50 m, from each other.
  • the luminance at angles larger than the cut-off angle ( ⁇ ) is smaller than 1000 Cd/m 2 . In this way, office glare requirements may be fulfilled. Especially, the luminance at angles larger than the cut-off angle ( ⁇ ) is smaller than 800
  • the luminance at all angles equal to or smaller than the cutoff angle is equal to or larger than 1000 Cd/m 2 , especially equal to or larger than 1500 Cd/m 2 , such as equal to or larger than 2000 Cd/m 2 .
  • values of about 5000 cd/m 2 to about 3.10 9 cd/m 2 such as 5000- 1.10 9 cd/m 2 can be achieved.
  • the luminance at all angles equal to or smaller than 0.9 times the cut-off angle i.e. 0.9* ⁇ is equal to or larger than 5000 Cd/m 2 .
  • the invention provides a method wherein the reflective surface comprises a plurality of facets with normals to the facets, the normals to the facets of the reflective object being within the virtual cone.
  • a reflective object comprising such a reflective surface may for instance be a convex mirror, or a facetted mirror, or a transparent object with mirroring surfaces integrated within the transparent object, or a drummed reflective surface (such as a drummed object with a reflective surface).
  • Such reflective objects, and especially their reflective surface are arranged to reflect and expand at least part of the parallel beam of light from the light source into a reflected and expanded beam of light. The beam of light propagates substantially horizontally through the space, whereas the reflected and expanded beam of light is directed to a horizontal surface and has the cut-off angle as defined herein.
  • the invention provides a method wherein the reflective surface comprises a plurality of n facets, with n normals to the facets, the n normals being, in a specific variant, not parallel to each other, and n being at least 4, especially at least 10, more especially at least 100, even more especially at least 1000.
  • the n normals are within the virtual cone.
  • the number of facets n may for instance be in the range of 4-1000, such as 10-1000, especially 100-1000.
  • n may be even larger, in principle may be infinitely large. In this way, a smooth or substantially even distribution of the reflected light may be obtained. Any bent surface, or any surface with discrete facets, is herein considered to have a plurality of facets.
  • the number of facets may in principle be infinite. All these facets have normals.
  • n facets with n normals are facets which are arranged to have normals within the virtual cone, i.e. these n facets of the reflective surface are arranged to fulfill the requirements defined herein.
  • the reflective surface may also comprise a plurality of facets the normals to which are outside the cone defined herein. Hence, parts (or facets) of the reflective surface will be arranged to have normals (to the facets or parts) that are within the virtual cone; further parts of the reflective surface may be arranged to have normals (to the facets) that may be outside the virtual cone.
  • the reflective surface is selected and arranged in such a way that the reflected light forms a beam of light having a cut-off angle equal to or smaller than 65° relative to a normal to a substantially horizontal surface in the space.
  • a simple mirroring ball as sometimes used in discotheques, will not be a suitable object, since such a ball may have a reflective surface with too many facets directing the reflected light at radiation angles larger or smaller than the cut-off angle of 65° (i.e. too many facets with normals outside the virtual cone), which make a high luminance at a work area and fulfillment of the glare norm not possible.
  • the parts of the reflective surface which are arranged to have normals (to the facets) that are within the virtual cone can be divided into two types of facets. All, or at least a subset (a plurality) of n facets, can be characterized in that these n facets have normals to the n facets, which, in a specific embodiment, are not parallel to each other, and n is at least 4, etc. (see also above). There may however be facets present that have normals which are parallel to the normals of the plurality (subset) of n normals. When a perfectly curved spherical reflective surface would be used which is arranged to provide n normals within the cone defined herein, no normal would be parallel to any other normal (i.e.
  • the n normals are in n planes). However, when for instance surfaces with a plurality of protrusions or a plurality of discrete facets are applied, there may be facets with normals that are parallel to each other. This will be further illustrated in the drawings.
  • the n normals of n facets that are not parallel form n planes. When also other facets are present with normals parallel to normals of the n facets, these normals will be in one or more of these planes.
  • the reflective object is at least partially transmissive. In this way, light that is transmitted through an upstream (i.e. closer to the light source) reflective object may be reflected by a downstream (further away from the light source) reflective object.
  • the area illuminated by the beam of light, when projected on the cross section is substantially equal to the area of the cross section. In this way, substantially all light is blocked, and no light is projected on for instance a wall across the light source. In a specific embodiment, the light blocked by the reflective object is only blocked by the reflective surface, such that no light is "lost".
  • the lighting system comprises a plurality of reflective objects.
  • the total area of the plurality of areas illuminated by the beam of light, when projected on the cross section may substantially be equal to the area of the cross section. In this way, substantially all light is blocked, and no light is projected on for instance a wall across the light source.
  • the light blocked by the reflective objects is only blocked by the reflective surfaces, such that no light is "lost".
  • the term "substantially equal” in this context relates to values that differ by not more than 10 %, especially by not more than 5%, even more especially by not more than 2%. For instance, when the cross section has an area of 100 cm 2 , and the area blocking the light when projected on the cross section is 98 cm 2 , the values differ by 2%.
  • the beam of light propagates at a beam height of at least 2.0 m relative to a floor, especially at least 2.2 m, more especially at least 2.5 m. In this way, an observer does not experience direct light from the light source.
  • the light source comprises, in an embodiment, one or more light sources selected from the group consisting of lasers and HID lamps (high intensity discharge lamps), especially short-arc HID lamps. Especially such light sources may provide relatively parallel beams. As is known in the art, such lamps may further comprise optics to provide parallel beams.
  • the light source may especially be arranged to generate a beam of light having an opening angle equal to or smaller than 5°, especially equal to or smaller than 2°. Also lasers or a plurality of lasers may be applied as light source.
  • Especially suitable light sources are UHP lamps.
  • the light source may especially comprise one or more light sources selected from the group consisting of lasers and UHP lamps.
  • either one HID, especially UHP lamp, or a plurality of lasers, will be applied in the lighting system to provide the beam of light to one reflective surface.
  • the light source is suitable for generating a substantially parallel beam of light, and during use generates such a beam.
  • the lighting system i.e. especially the light source, is arranged to provide a substantially horizontal beam of light.
  • the invention provides, according to a further aspect, a lighting system comprising a light source suitable for generating a beam of light which is substantially parallel, and a reflective object, comprising a reflective surface arrangeable at a distance >0.5 m from the light source, the reflective object being arranged to reflect and expand the beam of light into a reflected expanded beam of light having a cut-off angle equal to or smaller than 65°.
  • a lighting system or more particularly the separate entities thereof, i.e. light source and reflective object, are constructed and arrangeable to perform the method according to the invention.
  • the invention provides a package comprising one or more light sources and one or more reflective objects as defined herein and optionally comprising one or more of a lighting fixture and means for providing an electric infrastructure for lighting.
  • a package may be a package for sale to consumers or retailers or wholesale dealers or project developers, architects, etc.
  • the one or more of a lighting fixture and means for providing electric infrastructure may include one or more of connectors for the reflective object and for the light source attached to walls, ceilings, or posts, etc., wires, switches, sensors, transformers, etc.
  • the invention provides, in another aspect, a wall comprising the light source suitable for generating a beam of light which is substantially parallel, the light source being integrated in the wall, such as movable wall module.
  • the beam of light may be movable; in an embodiment, the height of the beam may thus be movable.
  • a wall is provided wherein the light source is arranged to generate a beam of light during application of the wall as wall and during use of the light source at a height of at least 2.0 m, more especially at least 2.2 m.
  • an office comprising a lighting system according to the invention, such as an office wherein the light source is arranged to have the beam of light, during use, propagate at a beam height of at least 2.0 m, especially at least 2.2 m, relative to a floor.
  • Figures la-g schematically depict a number of embodiments of the reflective object according to the invention and illustrate the principles of the invention
  • Figure 2 schematically depicts an embodiment of the invention with a light source and a reflective object for use in for instance an office;
  • Figures 3a-3b schematically depict an embodiment of the invention with a light source and a plurality of reflective objects for use in for instance an office;
  • Figures 4a-4c schematically depict an embodiment of the invention with a light source and a reflective object with a plurality of reflective surfaces and some variants on this reflective object;
  • Figure 5 schematically depicts an embodiment of the invention with a light source and a reflective object, wherein part of the reflective object is used to illuminate a ceiling above the reflective object.
  • the reflective object is, in a specific embodiment, a beam expander that expands a substantially parallel beam of light that propagates substantially horizontally through a space into a reflected and expanded beam of light, especially in the direction of a horizontal surface such as a floor.
  • the term floor may in a specific embodiment also include stairs.
  • the expanded beam of light in an embodiment, has cut-off angles ⁇ at 65° or smaller, thereby fulfilling the glare norm as defined for instance in European Standard EN 12464-1 (see below). Below, some embodiments of the reflective object are described in more detail.
  • the "reflected and expanded beam of light” is also indicated as reflected beam of light or expanded beam of light. It refers to the beam of light downstream of the reflective surface after reflection at this reflective surface.
  • FIGS. Ia-Ic schematically depict some of the principles of the invention. These Figures show a beam of light 20 (here as a single ray), which is substantially parallel and which propagates substantially horizontally. A reflective object 30 with a reflective surface 31 is shown. The beam 20 hits the reflective surface 31 at a certain point, which for the sake of understanding is indicated with reference CT, which reference also refers to a cone top of a virtual cone C (herein also indicated as cone, unless indicated otherwise).
  • CT which reference also refers to a cone top of a virtual cone C (herein also indicated as cone, unless indicated otherwise).
  • This cone has a cone axis CA, which includes an angle ⁇ with the beam of light 20.
  • This cone axis CA is in a vertical plane VP, which plane VP is further parallel to the beam of light 20 and which comprises at least part of the beam of light 20.
  • This vertical plane VP is here the plane of the drawing.
  • the cone axis CA is in a vertical plane VP, which plane VP is further parallel to the beam of light 20 and which comprises at least part of the beam of light 20" especially refers to the situation that the cone axis CA is in the same plane as at least one of the parallel rays within the parallel beam 20. In the drawing, this is the xz-plane.
  • the virtual cone C is also indicated as cone C.
  • the cone has a cone angle which is indicated with reference ⁇ .
  • the angle 2 ⁇ is sometimes also indicated as cone aperture angle or aperture angle.
  • ⁇ is substantially equal to 45°, here 45 ⁇ 5°.
  • ⁇ 45°.
  • ⁇ is substantially equal to or smaller than 32.5°.
  • ⁇ is 32.5°.
  • ⁇ 20°.
  • the cone C is defined as a cone with cone angle ⁇ around the cone axis CA.
  • the cone axis CA is in the plane of the drawing (Ia, Ib, If and Ig), i.e. the above-defined vertical plane VP; and around this axis CA, thus also in front of and behind the plane of drawing, the virtual cone C is arranged.
  • the surface of the cone C is indicated as cone surface CS. This is the surface that is limited by angle ⁇ , as defined herein; within this cone C, the normal N is found of the reflective surface 31 arranged according to the method of the invention.
  • This virtual cone C is used to specify the arrangement of reflective surface 31, or more especially the arrangement of a part of reflective surface 31.
  • a normal N can be arranged to any part of the reflective surface 31.
  • the reflective surface will have a number of different normals, in order to allow expansion of the substantially parallel beam 20 into the expanded reflected beam 21 (see also below). If there was only one normal N, i.e. at each part of the reflective surface 31 the normal is a normal N and these normals N are parallel, then the beam of light 20 would not be expanded but simply reflected. Note that the normal N is not necessarily in the plane VP.
  • the reflective surface 31 will in general have a plurality of normals N which are not parallel. Hence, the reflective surface 31 will in general be a surface that is curved and/or otherwise non-flat.
  • normal N is that this normal is within the virtual cone C, i.e. the reflective surface 31, or parts of the reflective surface 31 are arranged in such a way that normals N to the reflective surface 31 are found within the cone C.
  • FIG. 1b schematically depicts a curved reflective surface 31 with a number of cone tops or positions where the beam 20 (i.e. rays within the beam) hit the reflective surface 31, which for the sake of understanding are indicated with reference numbers CT (CTl, CT2 and CT3).
  • CT CT
  • CT2 and CT3 reference numbers
  • Each cone C for the sake of understanding indicated as cones Cl, C2, ..., includes an (identical) angle ⁇ with the beam 20, and each cone has a(n identical) cone angle ⁇ or a cone aperture 2* ⁇ .
  • the normal N to the surface here Nl
  • the normals N2 and N3 at positions CT2 and CT3, respectively are also within the cone C (i.e. C2 and C3, respectively). As shown in this Figure, the normals N are not parallel.
  • the normals N seem to be in the same plane, but as mentioned above, they may in general also be in different planes (in the y-direction, the reflective surface may be curved or otherwise non-flat).
  • the positions with normals Nl, N2, N3, etc., are parts of the reflective surface that are herein also indicated as facets 32 (here, for the sake of understanding, indicated with reference numbers 32*, 32**, 32***, etc.).
  • the reflective surface 31 is arranged relative to the beam of light 20, such that normals N to the surface are within the virtual cone C.
  • this does not exclude that parts of the reflective surface 31 have normals which are outside the cone C.
  • Some light of the beam of light 20 may be reflected and expanded outside the cut-off angle ⁇ . However, most of the light will be within the cut-off angle ⁇ .
  • the luminance is smaller than 1000 Cd/m 2 , such as smaller than 800 Cd/m 2 .
  • at least 50 %, especially at least 80 %, of the total power of the reflected light is found within angle ⁇ .
  • the contrast ratio between light within ⁇ and light outside ⁇ is especially at least 3:1, more especially at least 5:1.
  • ⁇ is equal to or smaller than 20°.
  • the cut-off angle ⁇ is equal to or smaller than 40°.
  • the normals N of reflective surface 31 defined by cone C define a reflected beam of light 21 with the desired properties.
  • RCB see Figure Ic.
  • This spot of light here on floor 70, is found within a projection cone defined by angel ⁇ (with aperture 2* ⁇ ) with "projection cone axis" or normal 2. This does not exclude asymmetric spots, i.e. asymmetric beams of light 21, having for instance an elliptic shape, a banana- like shape, etc., however, the cut off angle ⁇ is in general always 65° or smaller.
  • the reflective surface 31 comprises a plurality of n facets 32, indicated with reference numbers 32*, 32**, ..., with n normals N, indicated with reference numbers Nl, N2, ..., to the facets 32*, 32**, ..., respectively; in a specific embodiment the n normals Nl, N2, ... are not parallel, and n is at least 4.
  • the n facets 32 have n normals N which are each within the virtual cone C. Examples of such embodiments are schematically depicted in Figures Ib and Ie by means of curved reflective surfaces 31, and in Figures If and Ig by means of facetted reflective surfaces 31 with discrete facets 32.
  • the term "facets” refers to parts of surfaces (such as in Figures Ib and Ie) or (small) discrete surfaces (such as in Figures If and Ig) which have normals N which are not parallel to each other. This does not exclude the presence of sets of facets 32 with parallel normals N. It also does not exclude the presence of facets 32 with normals that are outside the cone C.
  • the reflective surface 31 has a plurality of n normals Nl, N2, ..., the n normals (Nl, N2, ...) especially not being parallel to each other, wherein n is at least 4.
  • Each facet 32 (32*, 32**, ...) has a normal N (Nl, N2, 7), as schematically depicted in the Figures.
  • n is at least 4, especially at least 10, more especially at least 100, even more especially at least 1000.
  • the number n may for instance be in the range of 4-1000, such as 10-1000, especially 100-1000.
  • n may be even larger, in fact may be infinitely large. In this way, a smooth or substantially even distribution of the reflected light may be obtained.
  • a (sub)set of n normals N will not be in the same plane.
  • the n normals N are in n planes.
  • the reflective surface 31 has a plurality of parts or facets 32, each having a normal N.
  • the total number of facets 32 and thus the total number of normals N may by way of explanation be indicated with a number k. At least part of the total number k of facets 32 will have normals N that are within cone C.
  • normals N1-N3 are within the cone C (indicated with cones C1-C3), but the reflective surface 31 may also have areas, such as areas below 32*** or above 32* which have normals N outside cone C (which thus provide reflections outside ⁇ ).
  • the reflective surface 31 comprises a plurality of n facets 32 with n normals N to the facets, respectively, wherein the n normals are not parallel, and wherein n is at least 4, especially at least 10, more especially at least 1000.
  • n is at least 4, especially at least 10, more especially at least 1000.
  • the number m may be equal to or larger than n.
  • the number m is at least 2*n, such as at least 10*n.
  • n normals to n facets, wherein the n normals are not parallel especially refers to reflective surfaces which comprise a plurality of facets with normals which are not parallel, but which may further include facets that have normals parallel to one or more other normals.
  • the cone C has a cross section CB perpendicular to the cone axis CA, wherein the cross section CB is divided into n domains s, the reflective surface 31 comprises n normals N, each normal intersecting a domain s, respectively, and n is at least 4.
  • Figure Ic the cross section CB in this example is divided into 8 domains s. Assuming 8 different facets 32 (see for instance Figures Ib and Ig which show a number of different facets 32), each of these facets
  • facets 32*, 32** and 32*** provide normals Nl, N2 and N3, which each intersect different domains of the cross section CB (not depicted in Figure Ib).
  • the reflective surface 31, and especially the facets 32 are arranged according to the conditions described above, thereby providing the reflected beam of light 21.
  • This reflected beam of light 21 also has a cross section, indicated with RCB, with domains rs. Each domain s corresponds to a domain rs.
  • Figures Ia-Ic, and Ie-Ig schematically depict side views of an embodiment of the reflecting object, indicated with reference number 30, suspended from a ceiling 65 by means of arm, holder or connector 40, arranged to attach the reflective object 30 to the ceiling 65.
  • Reflective object 30 may also be integrated in the ceiling 40, for instance as a substitute panel.
  • reflective object 30 may be adjustable, i.e. it may be translated and/or rotated (i.e. is translatable and rotatable).
  • a beam of light 20 is provided.
  • the beam of light 20 is substantially parallel and propagates through a space 1 substantially horizontally, i.e. substantially parallel to a substantially horizontal surface 4, such as a floor 70.
  • Reference number 3 refers to the so-called "nadir”.
  • the area of the reflective object 30 illuminated by beam of light 20 is indicated with reference number 39.
  • the beam of light 20 has a cross section, indicated with reference number 29. In a specific embodiment, this area 39 corresponds to the area of the reflective surface 31, when projected on the cross section 29.
  • the cut-off angle ⁇ is 55° or smaller, such as 40° or smaller.
  • cut-off angle is known to the person skilled in the art and refers to the angle formed by a line drawn from the direction of the direct light at the light source (here the reflective surface 31) with respect to a vertical (here normal 2), beyond which no direct light is emitted.
  • the phrase "beyond which no direct light is emitted” is to be understood in the sense of European Standard EN 12464-1 (-SC/02168, November 2002), wherein the limit is set at a luminance of ⁇ 1000 cd/m 2 .
  • ⁇ defines in an embodiment the reflected beam of light 21, wherein a luminance is provided of at least 1000 cd/m 2 and wherein at angles larger than ⁇ a luminance is provided of ⁇ 1000 cd/m 2 .
  • the luminance is at least 1000 cd/m 2 , and in a variation, at all radiation angles ⁇ 0.9* ⁇ , the luminance is > 5000 Cd/m 2 .
  • the maximum luminance is limited by about the maximum luminance of the light source 10.
  • the radiation angle is the angle at which the light from the beam of light 20 is reflected by the reflective surface 31 relative to normal 2.
  • the radiation angle can also be indicated as the reflection angle. It is the angle at which rays are reflected at the reflective surface 31 relative to normal 2.
  • the radiation angle is ⁇ , at the normal n, the radiation angle is 0°.
  • the radiation angle is in some Figures also indicated with reference ⁇ .
  • the reflected beam of light 21 is characterized by light that is reflected at radiation angles ⁇ , between 0- ⁇ . At radiation angles ⁇ larger than ⁇ , also reflections may be found, however, at angles larger than ⁇ , as mentioned above, the luminance is less than 1000 cd/m 2 , especially less than 800 cd/m 2 .
  • the beam of light 20 comprises rays, which in some Figures are indicated by way of example.
  • the reflected and expanded beam of light 21 comprises rays, which in some figures are indicated by way of example.
  • the reflected rays are indicated to have an angle ⁇ relative to the normal 2 to the substantially horizontal surface 4 in the space 1.
  • the luminance within the beam of light 20 at all angles ⁇ 0.9* ⁇ relative to normal is > 5000 Cd/m 2 .
  • a projection cone with cone axis 2 and a cone surface limited by ⁇ , at angles equal to or smaller than ⁇ the luminance is at least 1000 cd/m 2
  • at all angles ⁇ ⁇ 0.9* ⁇ i.e. a "cone within a cone", especially at all angles ⁇ ⁇ 0.8* ⁇
  • the luminance is at least 5000 cd/m 2 .
  • the embodiment of the reflective object 30 schematically depicted in Figures Ib and Ie has reflective surfaces 31 which are bent.
  • FIG. 31 Figure If schematically depicts an embodiment of reflective object 30, wherein the reflective surface 31 comprises a plurality of facets, indicated as facets 32*, 32**, etc.
  • a reflective surface 31 may for instance be a reflective surface comprising elevations and indentations in the form small bumps, trigonal pyramids, square pyramids, triangular edges or ridges, etc.
  • Such elevations may have flat surfaces or may have curved surfaces.
  • the distribution may be a random distribution or a regular distribution or a combination thereof.
  • drummed or hammered reflective surfaces may be used.
  • Figure Ig schematically depicts an embodiment of reflective object 30 that comprises a transparent material, i.e. a reflective object 30 is provided that is at least partially transmissive.
  • a reflective object 30 is provided that is at least partially transmissive.
  • facets 32*, 32**, etc. are present, reflecting at least part of the light of the beam of light 20 in reflected beam of light 21.
  • Such facets 32*, 32**, etc. may in a specific embodiment be one or more surfaces of light-ingress edges, such as for instance described in WO2005/073622, which is incorporated herein by reference.
  • Transmissive herein refers to reflective objects which allow transmission of the light of beam of light 20 of at least about 30 %, especially at least about 50 %.
  • the facets 32 here light-ingress edges, are depicted in Figure Ig as rectangular flat light ingress edges or facets. However, these facets 32 may also comprise curved facets. Likewise, the discrete facets 32 as schematically depicted in Figure If may also comprise curved facets. The facets may be ordered randomly or regularly or a combination thereof. Reflective surfaces 31 , like for instance schematically depicted in Figures If and Ig, may provide a kind of diffuse reflection of light of beam of light 20, which diffusely reflected light has cut-off angle ⁇ .
  • Transparent materials which can be used may for instance be selected from the group consisting of glass, poly methyl acrylate (PMA), poly methyl methacrylate (PMMA) (Plexiglas or Perspex), cellulose acetate butyrate (CAB), polycarbonate, poly vinyl chloride (PVC), polyethylene terephthalate (PET), and glycol-modif ⁇ ed polyethylene terephthalate (PETG), which materials may be provided as transparent sheets.
  • the sheet material comprises an acrylate, for instance PMA or PMMA, especially PMMA. Such materials are also known in the art as transparent plastics.
  • the sheet comprises transparent plastics commercially known as PERSPEXTM or PRISMEXTM. Other substantially transparent materials known to the person skilled in the art may also be used. Combinations of two (or more) materials may be used.
  • the reflective object 30 may also comprise a plurality of reflective surfaces
  • the light source, herein indicated with reference number 10, for use in the invention is especially a light source that produces a substantially parallel beam 20.
  • Parallel herein means that the opening angle CO of the beam 20 is not larger than 5°, especially not larger than 4°, and more especially not larger than 2°, even more especially not larger than 1°.
  • a parallel beam 20 is assumed, especially in view of the angles ⁇ , ⁇ and ⁇ , respectively, but there might be a slight deviation from parallelity.
  • the term "substantially parallel” refers to a beam having opening angles CO in the range of 0-5°, especially 0-4°, such as 0-2°, even more especially 0-1°.
  • the opening angle CO of beam of light 20 is especially defined as the angle defined by the full width at half maximum (FWHM) of the beam 20.
  • FWHM full width at half maximum
  • the beam may be limited or defined by the FWHM values.
  • the light from light source 10 is comprised in the beam 20; at intensities smaller than half the maximum intensity, the light is outside the beam 20.
  • Characteristic sources 10 are for instance lasers or HID lamps (High intensity discharge lamps), such as UHP lamps (ultra high performance lamps). Especially UHP lamps may be used in the method and lighting system of the invention. Other light sources 10 with optional optics to provide a parallel beam may also be applied. Especially suitable lamps are HID lamps with a short arc distance, such as an arc distance in the range of 0.5-10 mm, especially in the range of 0.5-2 mm, such as 0.7-2 mm, or especially 1-2 mm. Such lamps are for instance described in US 5,497,049, which is incorporated herein by reference. In an embodiment, the arc distance is smaller than 10 mm;in another embodiment, the arc distance is equal to or smaller than 2 mm.
  • Examples of other sources 10 may be LEDs.
  • the term light source 10 may also correspond to a plurality of light sources, which together provide the beam of light 20.
  • the light source 10 of the invention may not only comprise optics to provide a substantially parallel beam 20, but may in an embodiment also comprise optics to provide the beam at the desired place (see also below).
  • the height hi of light source 10 is especially the height where the beam of light 20 exits the light source 10.
  • the height of beam 20, is especially the height of the beam closest to the floor 70 at ⁇ . This is indicated in the Figures.
  • the lighting system is a luminaire comprising two entities, viz. a light source 10 and the above mentioned "beam expander".
  • the "beam expander” reflects and expands a substantially parallel beam of light which originates from the light source 10 and which propagates substantially horizontally through a space 1 in the direction of a horizontal surface, into a substantially expanded beam of light 21.
  • Figures 2-5 schematically depict embodiments of the invention with a light source 20 and one or more reflective objects 30 for use in an office 100.
  • the lighting system according to the invention is indicated with reference number 50.
  • the light source 10 of the lighting system 50 is especially arranged in space 1, for example attached to or integrated in a wall 60, such that during use of the lighting system 50, the light source 10 is at a height hi relative to floor 70, hi being in an embodiment at least 2.0 m, such as in the range of 2.0-10 m, especially 2.2-5 m. Further, the light source 10 is especially arranged in space 1, such that during use of the lighting system 50, the beam of light 20 propagates substantially horizontally, i.e. substantially parallel to a horizontal surface 4, such as floor 70. Hence, in a specific embodiment, the light source 20 is further arranged to generate a beam of light 20, during use, which propagates at a beam height h2 of at least 2.0 m (or higher) relative to the floor 70.
  • wall 60 comprises the light source 10 and, especially, the light source 10 is integrated in the wall 60.
  • the light source 10 is arranged within wall 60, such that the light source 10 does not extend beyond an external surface 61 of wall 60 (i.e. protrude in space 1).
  • the invention is however not limited to such embodiments.
  • the light source 10 may be arranged at other positions, for instance lower than h2, and with suitable additional optics, known to the person skilled in the art, the beam of light 20 may be brought to the desired height h2 and be arranged to propagate substantially horizontally at height h2.
  • the beam of light 20 may be movable in the plane of the wall 60, i.e. in the y- direction and/or z-direction.
  • wall 60 may comprise means, such as rails, arms, etc. to transport the light source 10 and/or optical devices to move the beam of light 20.
  • the wall 60 is especially a movable wall module, such as generally used in offices 100.
  • the light source(s) 10 may be integrated in or attached to wall 60, but may in an embodiment also be attached to a lamp post.
  • the beam of light 20 at least partially illuminates the reflective object 30, and especially at least part of the reflective surface 31.
  • the area 39 of reflective object 20 illuminated by the beam of light 20 substantially corresponds to the area of the reflective surface 31. In this way, loss of light due to absorption of light or scattering of light in non-useful directions may be precluded.
  • This beam of light 21 has cut-off angle ⁇ relative to normal 2.
  • the cut-off angle ⁇ is especially in the range of 10-65°, more especially in the range of 10-55°, i.e.
  • reflected beams of light 21 with cone aperture angles in the range of about 20-130° and 20-110°, respectively, are created during use of the lighting system 50.
  • reflected beams of light 21 may be substantially symmetric beams but may also be asymmetric beams 21, such as banana or elliptically shaped beams, but still within ⁇ .
  • the reflective object 30 is arranged at a distance L from the light source 10.
  • distance L is the mean distance from reflective surface 31 to the light source 10.
  • the distance L is in the range of about 0.5-100 m, such as 2-100, especially in the range of about 1-50 m, such as 2-50 m, or 2-10 m, like 2-5 m.
  • Figures 2-5 do not depict in detail the reflective objects 30, but the reflective objects schematically depicted therein may correspond to one of the reflective objects 30 depicted in the schematic Figures Ie-Ig.
  • Lighting system 50 thereby allows office 100 (or another space 1) to be illuminated at the desired place.
  • a plurality of lighting modules would be present, including the costly electric infrastructure for lighting, now the reflective object 30 may be arranged at a desired place, for instance above a working place, as schematically depicted in Figure 2, and a reduced lighting infrastructure may be applied, since above the office(s) 100 less or no electric infrastructure for lighting is required.
  • the area 39 illuminated by the beam of light 20, when projected on the cross section 29 of the beam of light 20, is in a specific embodiment substantially equal to the area of cross section 29. In this way, no light from the beam of light 20 propagates beyond reflective object 30 and thus no light is wasted.
  • the light source 10 may, in an embodiment, be integrated into wall 60, but may also be attached to wall 60. Further, light source 10 may also be integrated in or attached to a lamp post, or integrated in or attached to ceiling 65. In all embodiments, the light source 10 may comprise optics to provide the beam of light 20 at the desired height h2. For instance, referring to Figure 2, light source 20 may be arranged at height hi (for instance in wall 60), which may for instance be only 0.5 m.
  • the beam of light 20 may be provided at the desired height h2 and may propagate substantially parallel through the space 1 at height h2.
  • the light source 10 further comprises optics to provide the beam of light at height h2 and have the beam of light 20 propagate at height h2 through space 1.
  • the lighting system 50 comprises a plurality of reflective objects 30(1), 30(2), .... Such an embodiment and variants thereon are schematically depicted in Figures 3a-3c.
  • the term “plurality” may mean 2 or more, especially 3 or more and in a specific variant 2-10 elements.
  • the presence of a plurality of elements is herein also indicated with the notation " " or etc .
  • each reflective object 30 provides, during use of the lighting system 50, reflected beams of light 31(1), 31(2), etc.
  • distance L may be the mean distance from the source of light 20 to the reflective surface 31.
  • the reflective objects 30 of the plurality of reflective objects 30(1), 30(2) have a plurality of areas, indicated with reference numbers 39(1), 39(2), 39(3), respectively, which are illuminated by the beam of light 20.
  • This may be achieved in a number of ways.
  • Schematic Figures 3b and 3c depict an embodiment wherein the reflective objects are arranged in a "staggered" way, i.e. the first (relative to the light source 10) reflective object 30(1) reflects part of the beam of light 20, i.e. blocks part of the light of the beam of light 20, but part of the light of the beam of light 20 also passes the first reflective object 30(1). Part of the light that passes the first reflective object 30(1) is then reflected at reflective object 30(1), i.e. another part of the beam of light 20 is blocked by the second reflective object 30(2); etc.
  • the parts of the beam 20 that are blocked by the respective reflective objects 30 are substantially equal to the cross section 29 of the beam, i.e. the total area of the plurality of areas 39(1), 39(2), ... illuminated by the beam of light 20, and, when projected onto the cross section 29, are substantially equal to the area of the cross section 29, and thus, substantially no light of the beam of light 20 is wasted.
  • a top and front view of such an embodiment is schematically depicted in Figures 3b and 3 c, respectively.
  • Figures 4a-4c schematically depict an embodiment of the lighting system 50 of the invention with a plurality of light sources 10 and an embodiment of the reflective object 30, here with a plurality of reflective surfaces 31 (fig. 4a), and some variants on this embodiment of the reflective object 30 (Figs. 4b-4d).
  • FIG 4a schematically depicts an embodiment of a reflective object 30 having a kind of wig-shaped structure with two reflective surfaces 31, indicated as reflective surfaces 31 ' and 31".
  • the reflective obj ect 30 may have a plurality o f reflective surfaces 31 ', 31 ", ... etc.
  • each reflective surface 31 will be illuminated by a corresponding light source 10, i.e. the lighting system 50 in this embodiment comprises a combination of the first light source 10(1), arranged to illuminate the first reflective surface 31 ' of reflective object 30, and the second light source 10(2), arranged to illuminate the second reflective surface 31 " of reflective object 30; etc.
  • the reflective surfaces 31 each independently include an angle ⁇ with the respective beam of light 20, which angle is in the range described herein.
  • each reflective surface 31 may independently comprise an embodiment of the reflective surfaces 31 as described above (and as schematically depicted in Figures Ie- Ig)-
  • Each combination of light source 10 and reflective surface 31, during use of the lighting system 50 generates a reflected beam of light 21, in the Figure indicated as reflected beams 21(1), 21(2), etc..
  • the distance from light source 10(1) to the "corresponding" reflective surface 31 ' is indicated with reference number L(I); the distance from light source 10(2) to the "corresponding" reflective surface 31 " is indicated with reference number L(2); etc.
  • L(I), L(2), etc. are in the above described range.
  • the height h2 of the beams are indicated with h2(l) and h2(2).
  • FIG 4a The embodiment schematically depicted in Figure 4a may be seen as a combination of two lighting systems 50 as schematically depicted in Figure 2, wherein the reflective surfaces 31 are comprised in one reflective object 30.
  • one or more of the following shapes for one or more reflective objects 30 are selected from the group consisting of pyramids, truncated pyramids, wedges, truncated wedges, cupolas, truncated cupolas, and frusta.
  • One or more faces of such objects, or at least part of one or more of such faces, may be used as reflective surface(s) 31.
  • truncated cones, tetrahedrons or pyramids may be used.
  • other shapes may be used, such as pentagonal pyramids, triangular cupolas, square cupolas, pentagonal cupolas, pentagonal rotundas, or elongated types thereof like elongated cones, elongated square pyramids, elongated tetrahedrons, elongated pentagonal pyramids, elongated triangular cupolas, elongated square cupolas, elongated pentagonal cupolas, elongated pentagonal rotundas.
  • the reflective object 30 may be regularly shaped, but may also be irregularly or asymmetrically shaped.
  • one or more of the group of pyramids, truncated pyramids, wigs and truncated wigs is (are) applied as reflective object(s) 30, wherein a plurality of the faces of the object(s) 30 comprise a plurality of reflective surfaces 31 ', 31 ".
  • FIGs 4b and 4c schematically a perspective front view and top view of a truncated pyramid as reflective object 30 is shown. Note that in use, the reflective object 30 will suspend from the ceiling 65 upside down relative to the Figures 4b and 4c.
  • FIG 4b two reflective surfaces, surfaces 31 'and 31 " , are depicted
  • Figure 4c an upside-down view of a truncated pyramid-like reflective object 30, the reflective faces 31 ', 31", 31 '" and 31 "” are depicted.
  • two light sources 101(1) and 10(2), arranged substantially opposite each other, may be applied to illuminate the reflective faces 31 ' and 31 ", respectively, during use of the lighting system 50.
  • two sets of light sources 101(1) and 10(2), and 10(3) and 10(4) (not depicted), arranged substantially opposite each other in sets of two light sources 10, may be applied to illuminate, during use of the lighting system 50, the reflective faces 31 ' and 31 "', and 31 "and 31 "", respectively.
  • the four walls of an office 100 may each comprise a light source 10 for illuminating the reflective surfaces 31 of the reflective object 30.
  • Figure 4d schematically depicts in perspective a front view of a trigonal tetrahedron or pyramid as object 30 with reflective surfaces 31 ' and 31 " , etc.
  • the lighting system 50 comprises a plurality of reflective objects 30(1), 30(2), ..., each having a plurality of reflective surfaces 31 ', 31 ", ..., respectively.
  • Figure 5 schematically depicts an embodiment of the invention with the light source 10 and an embodiment of the reflective object 30, wherein part of the reflective object 30 is used to illuminate a ceiling 65 above the reflective object 30, i.e. the lighting system 50 comprises light source 10 suitable for generating the beam of light 20 which is substantially parallel and reflective object 30 comprising reflective surface 31 at a distance L >0.5 m from the light source 10, and the lighting system further comprises another light source 10(2) suitable for generating a beam of light 20(2) which is substantially parallel and arranged to illuminate a second reflective surface 32, which reflective surface 32 is arranged to illuminate ceiling 65 by a reflected beam of light 22.
  • the lighting system 50 comprises light source 10 suitable for generating the beam of light 20 which is substantially parallel and reflective object 30 comprising reflective surface 31 at a distance L >0.5 m from the light source 10
  • the lighting system further comprises another light source 10(2) suitable for generating a beam of light 20(2) which is substantially parallel and arranged to illuminate a second reflective surface 32, which reflective surface 32 is arranged to illuminate ceiling 65 by a reflected
  • the second light source 10(2) of the lighting system 50 is especially arranged in space 1, for example attached to or integrated in (another) wall 60, such that during use of the lighting system 50, the light source 10 is at a height hl(2) relative to floor 70 of at least 2 m, such as in the range of 2-10 m, especially 2-5 m. Further, the light source 10(2) is especially arranged in space 1, such that during use of the lighting system 50, the beam of light 20(2) propagates substantially horizontally, i.e. substantially parallel to a horizontal surface 4, such as floor 70.
  • the light source 20(2) is further arranged to generate a beam of light 20, during use, which propagates at a beam height h2(2) of at least 2.0 m relative to the floor 70.
  • the distance L(2) the mean distance from reflective surface 32 to the light source 10(2), is in a specific embodiment in the range of about 0.5-100 m, especially in the range of about 1-50 m.
  • space 1 may comprise a plurality of lighting systems 50(1), 50(2), 50(3), ...., (as described herein) and in the method of the invention a plurality of lighting systems 50(1), 50(2), 50(3), ... (as described herein) is applied.
  • the space 1 may be an office, but may also be a factory building, shop, hospital area, or any other space. Space 1 is especially an indoor space and the method of the invention is especially applied indoor.
  • the invention provides, in an embodiment, a method of illuminating at least part of a space 1, such as an office.
  • a lighting system 50 is provided in the space 1; the lighting system 50 comprises light source 10, arranged for suitably generating a substantially horizontal beam of light 20 which is substantially parallel, and reflective object 30, comprising reflective surface 31 , at a distance > 0.5 m from the light source 10.
  • the beam of light 20 is generated and irradiates the reflective surface 31.
  • the reflective object 30 is arranged to reflect and expand the beam of light 20 into a reflected expanded beam of light 21 having a cut-off angle ⁇ equal to or smaller than 65° relative to a normal to a substantially horizontal surface 4 in the space 1. In this way, costly electric infrastructure for lighting can be reduced and light can be generated at places in an office where this light is desired. Further, the glare norm may be fulfilled.
  • light used herein especially refers to visible radiation (VIS), i.e. radiation in the range of about 380-780 nm, and especially refers to white light. It should be noted that the terms “top” and “bottom”, and “left” and “right”, and first and second are interchangeable, unless the contrary is indicated or unless clear from the description.
  • VIS visible radiation

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention prévoit un procédé d'éclairage d'au moins une partie d'un espace (1), tel qu'un bureau. Un système d'éclairage (50) est prévu dans l'espace; le système d'éclairage comprend une source lumineuse (10) disposée et convenant pour générer un faisceau de lumière (20) sensiblement horizontal qui est sensiblement parallèle, et un objet réfléchissant (30), qui comprend une surface réfléchissante (31), à une distance ≥ 0,5 m de la source lumineuse (10). Le faisceau de lumière est généré et irradie la surface réfléchissante (31). L'objet réfléchissant (30) est disposé afin de réfléchir et de dilater le faisceau de lumière en un faisceau de lumière dilaté réfléchi (21) ayant un angle mort gamma égal ou inférieur à 65º par rapport à un plan normal (21) par rapport à une surface sensiblement horizontale dans l'espace. Ainsi, une infrastructure électrique d'éclairage coûteuse peut être éliminée et la lumière peut être générée à des endroits d'un bureau auxquels cette lumière est souhaitée. De plus, la norme d'éblouissement peut être respectée.
PCT/IB2008/052776 2007-07-11 2008-07-10 Procédé d'éclairage d'au moins une partie d'un espace et système d'éclairage destiné à être utilisé dans ce procédé WO2009007927A1 (fr)

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EP07112264 2007-07-11
EP07112264.2 2007-07-11

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WO2009007927A1 true WO2009007927A1 (fr) 2009-01-15

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2679888A3 (fr) * 2012-06-26 2014-01-22 Bartenbach Holding GmbH Dispositif d'éclairage
EP2679889A3 (fr) * 2012-06-26 2014-01-22 Bartenbach Holding GmbH Dispositif dýéclairage
US10544919B2 (en) 2016-09-22 2020-01-28 Signify Holding B.V Optical arrangement, lighting system and illumination method

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Publication number Priority date Publication date Assignee Title
US3065336A (en) * 1959-10-27 1962-11-20 Thorn Electrical Ind Ltd Means for lighting spaced compartments
EP0735311A1 (fr) * 1995-03-31 1996-10-02 Siemens Aktiengesellschaft Système d'éclairage intérieur
DE29622190U1 (de) * 1996-12-20 1997-04-03 Maurer, Ingo, 80801 München Beleuchtungsvorrichtung
FR2797676A1 (fr) * 1999-08-19 2001-02-23 Fd Eclairage Projecteur d'eclairage et installation d'eclairage a foyer lumineux deporte
WO2006040133A1 (fr) * 2004-10-11 2006-04-20 Dantec Ettemeyer Gmbh Procede d'eclairage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065336A (en) * 1959-10-27 1962-11-20 Thorn Electrical Ind Ltd Means for lighting spaced compartments
EP0735311A1 (fr) * 1995-03-31 1996-10-02 Siemens Aktiengesellschaft Système d'éclairage intérieur
DE29622190U1 (de) * 1996-12-20 1997-04-03 Maurer, Ingo, 80801 München Beleuchtungsvorrichtung
FR2797676A1 (fr) * 1999-08-19 2001-02-23 Fd Eclairage Projecteur d'eclairage et installation d'eclairage a foyer lumineux deporte
WO2006040133A1 (fr) * 2004-10-11 2006-04-20 Dantec Ettemeyer Gmbh Procede d'eclairage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2679888A3 (fr) * 2012-06-26 2014-01-22 Bartenbach Holding GmbH Dispositif d'éclairage
EP2679889A3 (fr) * 2012-06-26 2014-01-22 Bartenbach Holding GmbH Dispositif dýéclairage
US10544919B2 (en) 2016-09-22 2020-01-28 Signify Holding B.V Optical arrangement, lighting system and illumination method

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