JPH06111772A - High pressure discharge lamp - Google Patents
High pressure discharge lampInfo
- Publication number
- JPH06111772A JPH06111772A JP4260335A JP26033592A JPH06111772A JP H06111772 A JPH06111772 A JP H06111772A JP 4260335 A JP4260335 A JP 4260335A JP 26033592 A JP26033592 A JP 26033592A JP H06111772 A JPH06111772 A JP H06111772A
- Authority
- JP
- Japan
- Prior art keywords
- rare gas
- mercury
- discharge lamp
- pressure discharge
- high pressure
- Prior art date
- Legal status (The legal status 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 status listed.)
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Links
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- Discharge Lamp (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は従来のメタルハライドラ
ンプの発光管内に封入される封入物を改良した高圧放電
灯に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure discharge lamp in which the enclosure enclosed in the arc tube of a conventional metal halide lamp is improved.
【０００２】[0002]
【従来の技術】従来のメタルハライドランプは一対の電
極を内蔵する発光管内に、希ガスと水銀と金属ハロゲン
化物を封入し、点灯装置により一定入力で点灯するよう
になっている。2. Description of the Related Art In a conventional metal halide lamp, a rare gas, mercury, and a metal halide are enclosed in an arc tube having a pair of electrodes built therein, and the lamp is turned on by a constant input.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな従来のメタルハライドランプでは、ランプ電圧を維
持するために水銀を発光管内に封入しているので、その
メタルハライドランプを調光しようとすると放射光の色
特性が大きく変化してしまうという課題がある。However, in such a conventional metal halide lamp, mercury is enclosed in the arc tube in order to maintain the lamp voltage. Therefore, when the metal halide lamp is dimmed, radiated light is emitted. There is a problem that the color characteristics change greatly.
【０００４】例えば、発光管内にＮａＩ−ＳｃＩ3 −Ｈ
ｇを封入したメタルハライドランプでは、ランプ入力が
大きくて発光管内の温度が高いときには、図３の分光分
布図に示すようにＮａ，Ｓｃが主に発光するが、調光の
ためにランプ入力を下げると、発光管の温度が下がると
共に、低蒸気圧のＮａＩとＳｃＩ3 の発光管内の蒸気圧
が下がる。このために、図４の分光分布図に示すように
発光の主体が水銀となり、調光の前後では色特性が大き
く変化してしまう。For example, NaI-ScI 3 -H is placed in the arc tube.
In a metal halide lamp containing g, when the lamp input is large and the temperature inside the arc tube is high, Na and Sc mainly emit light as shown in the spectral distribution diagram of FIG. 3, but the lamp input is lowered for dimming. As a result, the temperature of the arc tube decreases, and the vapor pressure of NaI and ScI 3 having a low vapor pressure in the arc tube also decreases. For this reason, as shown in the spectral distribution chart of FIG. 4, the main body of light emission is mercury, and the color characteristics change greatly before and after dimming.
【０００５】また、調光のため入力を変化させるのにパ
ルス点灯を使用すると、一対の電極に供給するパルス電
流のデューティ比を制御するが、例えば方形のパルス電
流（波高値）を大きくして、オンデューティを小さくす
ると、パルス電流通過時にアーク温度が高くなり、励起
エネルギの大きい水銀発光が有利となって図４に示すよ
うな水銀の発光が主体となり、これと同一のランプ入力
でもパルス電流（波高値）を小さくしてオンデューティ
を大きくした場合の図３で示す分光分布よりも、水銀発
光が顕著になる。その結果、色温度が高くなり、平均演
色評価数Ｒａが低下する。When pulse lighting is used to change the input for dimming, the duty ratio of the pulse current supplied to the pair of electrodes is controlled. For example, a rectangular pulse current (peak value) is increased. When the on-duty is reduced, the arc temperature rises when the pulse current passes, and mercury emission with large excitation energy is advantageous, and the emission of mercury as shown in FIG. 4 becomes the main component. Mercury light emission becomes more prominent than the spectral distribution shown in FIG. 3 when the (peak value) is decreased and the on-duty is increased. As a result, the color temperature increases and the average color rendering index Ra decreases.
【０００６】また、始動点灯時には、希ガスが発光する
が、この希ガスの封入圧は数十からせいぜい２００torr
程度の低圧であり、効率も低いために、その発光は非常
に弱い上に、ランプ電圧を維持するバッファガスの水銀
が高抵抗であるので、瞬時始動（点灯）と再始動が行い
難いという課題もある。[0006] Further, the rare gas emits light at the time of starting and lighting, but the filling pressure of the rare gas is several tens to at most 200 torr.
The problem is that it is difficult to perform instant start (lighting) and restart because the light emission is very weak due to its low voltage and efficiency is low, and the buffer gas mercury that maintains the lamp voltage has high resistance. There is also.
【０００７】そこで本発明は、このような事情を考慮し
てなされたもので、その目的は調光による色特性の変化
を低減すると共に、瞬時始動と再始動を行なうことがで
きる高圧放電灯を提供することにある。Therefore, the present invention has been made in consideration of such circumstances, and an object thereof is to provide a high pressure discharge lamp capable of reducing a change in color characteristics due to dimming and performing an instant start and a restart. To provide.
【０００８】[0008]
【課題を解決するための手段】本発明は、従来のメタル
ハライドランプの課題が、発光管内に封入されている水
銀に起因するので、その水銀を除去したものであり、次
のように構成される。DISCLOSURE OF THE INVENTION Since the problem of the conventional metal halide lamp is caused by the mercury enclosed in the arc tube, the present invention eliminates the mercury, and is constructed as follows. .
【０００９】本願の請求項１に記載の発明（以下、第１
の発明という）は、パルス電圧が制御自在に印加される
一対の電極を内蔵した発光管内に、希ガスと金属ハロゲ
ン化物とを封入したことを特徴とする。The invention according to claim 1 of the present application (hereinafter, referred to as the first
The invention) is characterized in that a rare gas and a metal halide are enclosed in an arc tube containing a pair of electrodes to which a pulse voltage is controllably applied.
【００１０】また、本願の請求項２に記載の発明（以
下、第２の発明という）は、希ガスが、Ｘｅ，Ｋｒ、こ
れらの混合の少なくともいずれかであることを特徴とす
る。The invention according to claim 2 of the present application (hereinafter referred to as the second invention) is characterized in that the rare gas is at least one of Xe, Kr and a mixture thereof.
【００１１】さらに、本願の請求項３に記載の発明（以
下、第３の発明という）は、希ガスは、２気圧以上の圧
力で発光管内に封入されていることを特徴とする。Further, the invention according to claim 3 of the present application (hereinafter referred to as the third invention) is characterized in that the rare gas is sealed in the arc tube at a pressure of 2 atm or more.
【００１２】本願の請求項４に記載の発明（以下、第４
の発明という）は、請求項１記載の高圧放電灯を車体の
前面部に設けたことを特徴とする。The invention according to claim 4 of the present application (hereinafter, referred to as the fourth
The invention of claim 1) is characterized in that the high pressure discharge lamp according to claim 1 is provided on the front surface of the vehicle body.
【００１３】[0013]
〈第１，第２の発明〉Ｘｅ，Ｋｒ等の希ガスと金属ハロ
ゲン化物を発光管内に封入し、水銀を封入していないの
で、水銀に起因する調光による色特性の変化を低減する
ことができる。<First and Second Inventions> A rare gas such as Xe and Kr and a metal halide are enclosed in the arc tube and mercury is not enclosed, so that the change in the color characteristics due to the dimming caused by mercury is reduced. You can
【００１４】また、Ｘｅ，Ｋｒ等の希ガスは既にガス化
しているので、これらが蒸発する時間が必要でなく、光
束の立上りが良好であり、そのために、瞬時始動を容易
に行なうことができ、また始動の妨害をする大量の水銀
がないので比較的低いパルス電圧で再始動が可能であ
る。Further, since the rare gases such as Xe and Kr have already been gasified, there is no need for time to evaporate them, and the rising of the luminous flux is good, so that an instant start can be easily performed. Also, since there is no large amount of mercury that interferes with starting, restarting is possible with a relatively low pulse voltage.
【００１５】〈第３の発明〉希ガスを２気圧以上の圧力
で発光管内に封入しているが、これは従来例が数十から
せいぜい２００torr程度であるのに比して高圧であるの
で、電位傾度を増大させて明るさを高めることができ
る。<Third Invention> A rare gas is enclosed in the arc tube at a pressure of 2 atm or more. This is a high pressure, compared with the conventional example of about several dozens to 200 torr at most. The brightness can be increased by increasing the potential gradient.
【００１６】〈第４の発明〉第１の発明に係る高圧放電
灯は瞬時始動と再始動が容易であるので、この高圧放電
灯を車両の前照灯として組み込んでいる本発明は、この
前照灯の瞬時始動と再始動を行なうことができる。<Fourth Invention> Since the high pressure discharge lamp according to the first invention is easy to instantly start and restart, the present invention in which the high pressure discharge lamp is incorporated as a vehicle headlight is It is possible to instantly start and restart the lighting.
【００１７】[0017]
【実施例】以下、本発明の実施例を図面等に基づいて説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１８】図１は本発明の一実施例の高圧放電灯に、
点灯装置を接続した場合の構成を示す図であり、高圧放
電灯１は楕円球状の石英製発光管２内に、図中左右一対
の電極３ａ，３ｂを内蔵し、これら一対の電極３ａ，３
ｂに一対のリード線４ａ，４ｂを接続している。FIG. 1 shows a high pressure discharge lamp according to an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration in which a lighting device is connected, in which a high pressure discharge lamp 1 has a pair of left and right electrodes 3a and 3b in the figure, which are housed in an elliptic spherical quartz arc tube 2.
A pair of lead wires 4a and 4b are connected to b.
【００１９】一対のリード線４ａ，４ｂの先端部は、発
光管２の一対の封止端部５ａ，５ｂに埋設された各モリ
ブデン箔６ａ，６ｂを介して外部に延出している。The tip ends of the pair of lead wires 4a and 4b extend to the outside through the molybdenum foils 6a and 6b embedded in the pair of sealing ends 5a and 5b of the arc tube 2.
【００２０】そして、発光管２内にＸｅやＫｒ等の希ガ
スと金属ハロゲン化物とを封入している。このように構
成された高圧放電灯１の性能を検査するために、その一
対のリード線４ａ，４ｂに、例えば１５ＫＶのパルス電
圧を発生する始動回路７を接続すると共に、始動点灯時
に定常の８倍の電流を流す電流制御回路８と、パルスを
発生させるパルス回路９との直列回路とを並列に接続
し、パルス発生回路９には複数の調光スイッチを備えた
スイッチ盤１０を接続して次の実験を行なった。The arc tube 2 is filled with a rare gas such as Xe or Kr and a metal halide. In order to inspect the performance of the high-pressure discharge lamp 1 configured as described above, the pair of lead wires 4a and 4b is connected to a starting circuit 7 that generates a pulse voltage of, for example, 15 KV, and a steady 8 A series circuit of a current control circuit 8 for supplying a double current and a pulse circuit 9 for generating a pulse is connected in parallel, and a switch board 10 having a plurality of dimming switches is connected to the pulse generation circuit 9. The following experiment was conducted.
【００２１】まず、定格入力が１５０Ｗでランプ電流が
１．９Ａの高圧放電灯１の内部電極間距離を８mmに設定
し、内径が７mmの石英製発光管２内に、Ｘｅを５気圧、
NaIを１０mg、ＳｃＩ3 を２mgそれぞれ封入した。First, the distance between the internal electrodes of a high pressure discharge lamp 1 having a rated input of 150 W and a lamp current of 1.9 A was set to 8 mm, and Xe was set to 5 atm in a quartz arc tube 2 having an inner diameter of 7 mm.
10 mg of NaI and 2 mg of ScI 3 were encapsulated.
【００２２】そこで、高圧放電灯１の始動点灯時に、図
示しない電源スイッチを投入後、電流制御回路６の制御
により通常の８倍のランプ電流を通電してから、順次下
げていくことにより、図２に示すように光束を瞬時に立
ち上げることができる。このように始動時に大電流を通
電することにより、希ガスの発光効率の低下を補足して
瞬時点灯を可能にしている。Therefore, when the high-pressure discharge lamp 1 is turned on and turned on, a power switch (not shown) is turned on, a current of 8 times the normal lamp current is supplied by the control of the current control circuit 6, and then the current is gradually decreased. As shown in FIG. 2, the luminous flux can be instantly raised. In this way, by supplying a large current at the time of starting, it is possible to supplement the decrease in luminous efficiency of the rare gas and instantaneously light the lamp.
【００２３】また、次の表１に示すように調光スイッチ
〜を順次オンして、一対の電極３ａ，３ｂに通電さ
れるパルス電流の波高値等を適宜制御したところ、同表
に示すように、調光率を１００％〜２０％まで制御した
場合においても平均演色評価数Ｒａの変化が少なく、調
光による色特性の変化が小さいことが実証された。ま
た、ほぼ全体の調光率に亘って全光束が大きく、高効率
であることが判明した。そして、Ｘｅを２気圧以上で発
光管２内に封入しているので、電位傾度が増大するが、
通常の適用電源点灯では水銀と同等の電位傾度まで高め
ることはできない。しかし、一対の電極３ａ，３ｂに供
給するパルス電流のオンデューティを小さくすると、電
位傾度を水銀程度に増大させることができる。これは、
パルス電流が流れないときは発光管２内のアークが冷え
てアーク温度が低下するためにＸｅの希ガスの電気抵抗
が増大するためである。これにより、水銀と匹敵するラ
ンプ電圧を得ることができる。Further, as shown in Table 1 below, the dimmer switches (1) to (3) are sequentially turned on to appropriately control the crest value of the pulse current supplied to the pair of electrodes 3a and 3b. In addition, it was demonstrated that even when the dimming ratio was controlled to 100% to 20%, the change in the average color rendering index Ra was small, and the change in the color characteristics due to the dimming was small. Further, it was found that the total luminous flux was large over almost the entire dimming ratio and the efficiency was high. Then, since Xe is sealed in the arc tube 2 at 2 atm or more, the potential gradient increases,
It is not possible to raise the potential gradient to the level equivalent to that of mercury with normal application of power source lighting. However, if the on-duty of the pulse current supplied to the pair of electrodes 3a and 3b is reduced, the potential gradient can be increased to about mercury. this is,
This is because when the pulse current does not flow, the arc in the arc tube 2 cools and the arc temperature decreases, so that the electric resistance of the rare gas of Xe increases. This makes it possible to obtain a lamp voltage comparable to that of mercury.
【００２４】[0024]
【表１】 [Table 1]
【００２５】次に、発光管２内に、Ｘｅを５気圧、Ｄｙ
Ｂｒ3 を３mg、ＨｏＢｒ3 を３mg、ＴｍＢｒ3 を３mg、
ＣｓＩを５mgそれぞれ封入して、前記実施例と同様の実
験を行なったところ、次の表２のデータを得た。Next, Xe is introduced into the arc tube 2 under 5 atm and Dy.
Br 3 3 mg, HoBr 3 3 mg, TmBr 3 3 mg,
When 5 mg each of CsI was encapsulated and the same experiment as the above example was conducted, the data in the following Table 2 were obtained.
【００２６】[0026]
【表２】 [Table 2]
【００２７】この実験例では発光物質のＤｙ，Ｈｏ，Ｔ
ｍがそのハロゲン化物の蒸気圧が互いに近い上に、連続
スペクトル発光であるので、前記実験例よりも調光によ
る色温度の変化が少なく、高演色である。但し、効率は
若干劣る。In this experimental example, the luminescent materials Dy, Ho, T
Since m has a vapor pressure of its halides close to each other and continuous spectrum light emission, the change in color temperature due to dimming is smaller than that in the experimental example, and the color rendering is high. However, the efficiency is slightly inferior.
【００２８】なお、前記実験例では希ガスとしてＸｅを
封入した場合について説明したが、本発明はこれに限定
されるものではなく、希ガスとしてはＫｒでもよく、ま
たは、ＸｅとＫｒとの混合物でもよく、あるいはこれら
に他のガスを添加してもよい。In the above experimental example, the case where Xe is filled as the rare gas has been described, but the present invention is not limited to this, and the rare gas may be Kr or a mixture of Xe and Kr. Alternatively, another gas may be added to these.
【００２９】なお、複数の金属ハロゲン化物を組み合せ
る場合にはこれらの蒸気圧が互いにほぼ均衡するものが
よい。When a plurality of metal halides are combined, it is preferable that their vapor pressures are substantially balanced with each other.
【００３０】[0030]
【発明の効果】以上説明したように本願第１、第２の発
明は、発光管内に、Ｘｅ，Ｋｒ等の希ガスと金属ハロゲ
ン化物を封入し、水銀を封入しないので、水銀に起因す
る調光による色特性の変化を低減することができる。ま
た、Ｘｅ，Ｋｒ等の希ガスは既にガス化しているので、
これらをガス化する必要がなく、光束の立上りがよく、
瞬時始動と再始動とを容易に行なうことができる。As described above, according to the first and second inventions of the present application, since the rare gas such as Xe and Kr and the metal halide are enclosed in the arc tube and mercury is not enclosed, the adjustment caused by the mercury is performed. It is possible to reduce changes in color characteristics due to light. Also, since noble gases such as Xe and Kr have already been gasified,
There is no need to gasify these, the rise of the luminous flux is good,
Instant start and restart can be easily performed.
【００３１】また、本願第３の発明は希ガスを２気圧以
上の圧力で発光管内に封入するので、電位傾度を増大さ
せて明るさを高めることができる。In the third invention of the present application, since the rare gas is sealed in the arc tube at a pressure of 2 atm or more, the potential gradient can be increased and the brightness can be increased.
【００３２】さらに、本願第４の発明は瞬時始動と再始
動が行なえる第１の発明に係る高圧放電灯を車両用の前
照灯として組み込むので、この前照灯を瞬時始動と再始
動を行なうことができる。Further, the fourth invention of the present application incorporates the high-pressure discharge lamp according to the first invention capable of instantaneous starting and restarting as a vehicle headlamp, so that this headlamp can be instantaneously started and restarted. Can be done.
【図１】本願第１〜第３の発明を含む一実施例の高圧放
電灯とこれを点灯させる点灯装置の接続例を示す図。FIG. 1 is a diagram showing a connection example of a high pressure discharge lamp according to an embodiment including the first to third inventions of the present application and a lighting device for lighting the same.
【図２】図１で示す実験例の光束の立上りを示すグラ
フ。FIG. 2 is a graph showing rise of luminous flux in the experimental example shown in FIG.
【図３】従来のメタルハライドランプのランプ入力が大
きいときの分光分布を示す図。FIG. 3 is a diagram showing a spectral distribution when a lamp input of a conventional metal halide lamp is large.
【図４】従来のメタルハライドランプのランプ入力が小
さいときの分光分布を示す図。FIG. 4 is a diagram showing a spectral distribution when a lamp input of a conventional metal halide lamp is small.
１ 高圧放電灯 ２ 発光管 ３ａ，３ｂ 一対のリード線 ４ａ，４ｂ 一対のリード線 ５ａ，５ｂ 一対の封止端部 ６ａ，６ｂ 一対のモリブデン箔 ７ 始動回路 ８ 電流制御回路 ９ パルス回路 １０ スイッチ盤 1 high-pressure discharge lamp 2 arc tube 3a, 3b pair of lead wires 4a, 4b pair of lead wires 5a, 5b pair of sealing ends 6a, 6b pair of molybdenum foil 7 starting circuit 8 current control circuit 9 pulse circuit 10 switch panel
───────────────────────────────────────────────────── フロントページの続き (72)発明者 蛭田 寿男 東京都港区三田一丁目４番28号 東芝ライ テック株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Hikita 1-4-2-4 Mita, Minato-ku, Tokyo Toshiba Lighting & Technology Corporation
Claims (4)
の電極を内蔵した発光管内に、希ガスと金属ハロゲン化
物とを封入したことを特徴とする高圧放電灯。1. A high pressure discharge lamp characterized in that a rare gas and a metal halide are enclosed in an arc tube containing a pair of electrodes to which a pulse voltage is controllably applied.
少なくともいずれかであることを特徴とする請求項１記
載の高圧放電灯。2. The high pressure discharge lamp according to claim 1, wherein the rare gas is at least one of Xe, Kr and a mixture thereof.
に封入されていることを特徴とする請求項１または２記
載の高圧放電灯。3. The high pressure discharge lamp according to claim 1, wherein the rare gas is sealed in the arc tube at a pressure of 2 atm or more.
部に設けたことを特徴とする車両用前照灯。4. A vehicle headlamp comprising the high pressure discharge lamp according to claim 1 on a front surface of a vehicle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4260335A JPH06111772A (en) | 1992-09-29 | 1992-09-29 | High pressure discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4260335A JPH06111772A (en) | 1992-09-29 | 1992-09-29 | High pressure discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06111772A true JPH06111772A (en) | 1994-04-22 |
Family
ID=17346563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4260335A Pending JPH06111772A (en) | 1992-09-29 | 1992-09-29 | High pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06111772A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6639341B1 (en) | 1999-03-26 | 2003-10-28 | Matsushita Electric Works, Ltd. | Metal halide discharge lamp |
| US6670765B2 (en) | 2001-08-24 | 2003-12-30 | Stanley Electric Co., Ltd. | Mercury-free metal halide lamp, with contents and electric power control depending on resistance properties |
| US6724145B1 (en) | 1999-06-25 | 2004-04-20 | Stanley Electric Co., Ltd. | Discharge lamp |
| US6873109B2 (en) | 1997-06-06 | 2005-03-29 | Harison Toshiba Lighting Corporation | Metal halide discharge lamp, lighting device for metal halide discharge lamp, and illuminating apparatus using metal halide discharge lamp |
| WO2006046704A1 (en) * | 2004-10-29 | 2006-05-04 | Toshiba Lighting & Technology Corporation | Metal halide lamp and lighting equipment |
| JP2010531528A (en) * | 2007-06-25 | 2010-09-24 | ゼネラル・エレクトリック・カンパニイ | High-intensity discharge lamp with enhanced dimming characteristics |
-
1992
- 1992-09-29 JP JP4260335A patent/JPH06111772A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6873109B2 (en) | 1997-06-06 | 2005-03-29 | Harison Toshiba Lighting Corporation | Metal halide discharge lamp, lighting device for metal halide discharge lamp, and illuminating apparatus using metal halide discharge lamp |
| US7057349B2 (en) | 1997-06-06 | 2006-06-06 | Harison Toshiba Lighting Corporation | Lightening device for metal halide discharge lamp |
| US6639341B1 (en) | 1999-03-26 | 2003-10-28 | Matsushita Electric Works, Ltd. | Metal halide discharge lamp |
| US6724145B1 (en) | 1999-06-25 | 2004-04-20 | Stanley Electric Co., Ltd. | Discharge lamp |
| US6670765B2 (en) | 2001-08-24 | 2003-12-30 | Stanley Electric Co., Ltd. | Mercury-free metal halide lamp, with contents and electric power control depending on resistance properties |
| WO2006046704A1 (en) * | 2004-10-29 | 2006-05-04 | Toshiba Lighting & Technology Corporation | Metal halide lamp and lighting equipment |
| JPWO2006046704A1 (en) * | 2004-10-29 | 2008-05-22 | 東芝ライテック株式会社 | Metal halide lamp and lighting device |
| JP2010531528A (en) * | 2007-06-25 | 2010-09-24 | ゼネラル・エレクトリック・カンパニイ | High-intensity discharge lamp with enhanced dimming characteristics |
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