WO2003015126A1 - High-pressure discharge lamp and method of manufacturing it - Google Patents
High-pressure discharge lamp and method of manufacturing it Download PDFInfo
- Publication number
- WO2003015126A1 WO2003015126A1 PCT/IB2002/003255 IB0203255W WO03015126A1 WO 2003015126 A1 WO2003015126 A1 WO 2003015126A1 IB 0203255 W IB0203255 W IB 0203255W WO 03015126 A1 WO03015126 A1 WO 03015126A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hydrogen
- getter
- bulb
- wall
- pervious
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
- H01J61/26—Means for absorbing or adsorbing gas, e.g. by gettering; Means for preventing blackening of the envelope
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/34—Double-wall vessels or containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
Definitions
- the invention relates to a high-pressure gas discharge lamp comprising an inner bulb forming a discharge vessel filled with a gas filling and provided with electrodes between which, during operation, a discharge takes place, and comprising an outer bulb provided around the inner bulb so as to form an interspace, a hydrogen getter comprising a getter material surrounded by a wall that is pervious to hydrogen being provided.
- the invention particularly relates to a high-pressure mercury vapor discharge lamp and a high- pressure metal halide vapor discharge lamp of this type.
- the invention also relates to a method of manufacturing such a high-pressure gas discharge lamp.
- Such a high-pressure gas discharge lamp is known from Japanese patent specification No. 53-94468 (Tokyo Shibaura Electric Co.).
- High-pressure gas discharge lamps contain a gas filling in which the discharge is maintained.
- This gas filling may be composed of, for example, one or more inert gases, mercury, cadmium, sodium, one or more metal halides or mixtures of said elements and compounds.
- Many of these components used for the gas filling are aggressive, i.e. they are capable of reacting in an undesirable manner with components of the lamp. For this reason, the lamp components that come into contact with the gas filling are made of materials that are resistant to the gas filling.
- high-pressure sodium vapor discharge lamps for example, a sodium-resistant discharge vessel is used, while in high-pressure mercury vapor discharge lamps and high-pressure metal halide vapor discharge lamps quartz is generally used as the material for the discharge vessel, and tungsten is used as the electrode material.
- aggressive gas filling is to be taken to mean a gas filling comprising at least one component that is capable of attacking a lamp component by chemical and/or physical reactions at least at the operating temperature of the lamp.
- gaseous impurities in gas discharge lamps.
- These impurities may be introduced, for example, in the course of the manufacture of the lamps. It is also possible that these impurities are released from the lamp wall or the lamp filling during the service life of the lamp. It has been found that particularly the presence of hydrogen in gas discharge lamps has a very disturbing effect since the presence of very small quantities thereof already leads to a substantial increase of the (re-)ignition voltage of such lamps. It is possible to keep the hydrogen content of these lamps within acceptable limits by taking additional measures during the manufacturing process of the lamp. These additional measures however lead to a substantial increase in the cost of the lamp and, in addition, it has been found that the hydrogen content, especially during the service life of the lamp, cannot be controlled in a reproducible manner.
- a hydrogen getter in gas discharge lamps, the getter material used being, for example, thorium, hafnium, zirconium, titanium, yttrium or lanthanum.
- the getter material used being, for example, thorium, hafnium, zirconium, titanium, yttrium or lanthanum.
- a drawback of the gas discharge lamp disclosed in the above-mentioned Japanese patent specification resides in that the mounting of the hydrogen getter in the inner bulb is found to be disadvantageous in practice since the space available for welding the capsule to the inner wall of the inner bulb is small. In addition, there is a risk that impurities are introduced into the inner bulb, while the material to be used with the hydrogen getter must be resistant to aggressive gas filling components and not allow passage of these components.
- a high-pressure gas discharge lamp of the type mentioned in the opening paragraph is characterized in accordance with the invention in that the hydrogen getter is provided in the interspace between the inner bulb and the outer bulb.
- the wall that is pervious to hydrogen is formed by a capsule, while said wall is secured, in particular, to the stem of the lamp onto which the inner bulb is also mounted in general.
- the wall that is pervious to hydrogen is secured to the inner wall of the outer bulb by means of welding.
- the hydrogen getter situated in the interspace between the inner bulb and the outer bulb efficiently "captures" hydrogen originating from materials present in the interspace, which hydrogen would normally diffuse through the inner bulb into the discharge vessel with all its adverse consequences, and it also efficiently captures hydrogen originating from the wall of the inner bulb.
- the hydrogen getter serves to control the hydrogen pressure in the inner bulb during the service life of the lamp, said hydrogen getter removing the above-mentioned external hydrogen source in the interspace and absorbing (part of the) hydrogen from (the wall of) the inner bulb. It goes without saying that the hydrogen getter in question does not come into contact with possibly aggressive gas filling components and hence does not have to be resistant to such components. By virtue thereof, other hydrogen getter materials that are, in particular, cheaper than those used in the prior art can be employed.
- the wall that is pervious to hydrogen is at least predominantly made of quartz.
- the wall that is pervious to hydrogen is at least substantially made of a ceramic material, for example aluminum(tri)oxide, or of a metal, such as niobium. In principle, any material that is pervious to hydrogen can be used.
- the wall that is pervious to hydrogen in particular the capsule, also has the following functions.
- this wall (capsule) precludes that gas, such as nitrogen, present in the interspace between the inner bulb and the outer bulb can damage or destroy the getter material, while, on the other hand, the wall (capsule) makes sure that material from a holder of the getter material that evaporates as a result of the high operating temperature of the lamp does not enter the interspace, thereby precluding unacceptable blackening of internal lamp components, such as the walls of the inner and outer bulbs.
- the protection of the getter material by the wall that is pervious to hydrogen (capsule) enables getter materials and/or additional gases other than those customarily used to be employed.
- the wall that is pervious to hydrogen comprises at least one perforation.
- the wall that is pervious to hydrogen is porous and/or thinner than existing walls.
- the invention also relates to a method of manufacturing a high-pressure gas discharge lamp, wherein use is made of an inner bulb that forms a discharge vessel that is filled with a gas filling and provided with electrodes between which, during operation, a discharge takes place, and wherein use is also made of an outer bulb provided around the inner bulb so as to form an interspace, while using a hydrogen getter comprising a getter material surrounded by a wall that is pervious to hydrogen, characterized in that the hydrogen getter is arranged in the interspace between the inner bulb and the outer bulb.
- a tubular, quartz glass inner bulb, i.e. discharge vessel 1, of a metal halide vapor discharge lamp in accordance with the invention is shown.
- tungsten electrodes 2, 3 are provided which are passed through pinches 6, 7 of the discharge vessel 1 in a vacuumtight manner by means of molybdenum foils 4, 5.
- the inner bulb, or discharge vessel 1 is accommodated in a diagrammatically shown glass outer bulb 8 and provided with an amount of mercury that evaporates completely during operation of the lamp, and said inner bulb additionally comprises a small quantity of argon as the starting gas, as well as iodides of sodium, thallium and indium.
- the internal diameter of the inner bulb 1 is 15 mm, and the distance between the electrodes 2, 3 is 41 mm.
- the lamp is intended for a power of 400 W.
- a hydrogen getter 10 is provided, which is depicted on an enlarged scale for clarity.
- Said getter 10 comprises a sealed yet pervious to hydrogen capsule 11 of quartz which is secured on the stem 12 of the lamp on which also the inner bulb 1 is mounted.
- the actual getter material 13 is present in the capsule 11. Hydrogen present in the interspace 9 is absorbed by the getter material 13 via diffusion through the capsule 11 that is pervious to hydrogen.
- the capsule 11 is not in contact with aggressive gas filling components in the inner bulb 1 , so that the capsule does not have to be resistant to these components and does not have to be impervious to these components, as is the case in the prior art. It is to be noted that the invention is not limited to the embodiment described herein but also includes other preferred modifications that fall within the scope of the appended claims.
Abstract
A high-pressure gas discharge lamp comprising an inner bulb (1) forming a discharge vessel filled with a gas filling and equipped with electrodes (2, 3) between which a discharge takes place during operation, and comprising an outer bulb (8) placed around the inner bulb (1) so as to form an interspace (9), a hydrogen getter (10) consisting of a getter material (13) surrounded by a wall (11) that is pervious to hydrogen being provided, characterized in that the hydrogen (10) getter is mounted in the interspace (9) between the inner bulb (1) and the outer bulb.(8)
Description
HIGH-PRESSURE DISCHARGE LAMP AND METHOD OF MANUFACTURING IT.
The invention relates to a high-pressure gas discharge lamp comprising an inner bulb forming a discharge vessel filled with a gas filling and provided with electrodes between which, during operation, a discharge takes place, and comprising an outer bulb provided around the inner bulb so as to form an interspace, a hydrogen getter comprising a getter material surrounded by a wall that is pervious to hydrogen being provided. The invention particularly relates to a high-pressure mercury vapor discharge lamp and a high- pressure metal halide vapor discharge lamp of this type. The invention also relates to a method of manufacturing such a high-pressure gas discharge lamp.
Such a high-pressure gas discharge lamp is known from Japanese patent specification No. 53-94468 (Tokyo Shibaura Electric Co.).
High-pressure gas discharge lamps contain a gas filling in which the discharge is maintained. This gas filling may be composed of, for example, one or more inert gases, mercury, cadmium, sodium, one or more metal halides or mixtures of said elements and compounds. Many of these components used for the gas filling are aggressive, i.e. they are capable of reacting in an undesirable manner with components of the lamp. For this reason, the lamp components that come into contact with the gas filling are made of materials that are resistant to the gas filling. In high-pressure sodium vapor discharge lamps, for example, a sodium-resistant discharge vessel is used, while in high-pressure mercury vapor discharge lamps and high-pressure metal halide vapor discharge lamps quartz is generally used as the material for the discharge vessel, and tungsten is used as the electrode material. In this connection, the term aggressive gas filling is to be taken to mean a gas filling comprising at least one component that is capable of attacking a lamp component by chemical and/or physical reactions at least at the operating temperature of the lamp.
In general, it is desirable to minimize the occurrence of gaseous impurities in gas discharge lamps. These impurities may be introduced, for example, in the course of the manufacture of the lamps. It is also possible that these impurities are released from the lamp wall or the lamp filling during the service life of the lamp. It has been found that particularly the presence of hydrogen in gas discharge lamps has a very disturbing effect since the presence of very small quantities thereof already leads to a substantial increase of the
(re-)ignition voltage of such lamps. It is possible to keep the hydrogen content of these lamps within acceptable limits by taking additional measures during the manufacturing process of the lamp. These additional measures however lead to a substantial increase in the cost of the lamp and, in addition, it has been found that the hydrogen content, especially during the service life of the lamp, cannot be controlled in a reproducible manner.
It is generally known to use a hydrogen getter in gas discharge lamps, the getter material used being, for example, thorium, hafnium, zirconium, titanium, yttrium or lanthanum. For example, in the above-mentioned Japanese patent publication it is proposed to mount a hydrogen getter in the inner bulb forming the discharge vessel, which getter is made of a hydrogen-absorbing material, in particular zirconium, held in a capsule made of a material that is pervious to hydrogen, such as quartz or aluminum(tri)oxide. In this manner, any hydrogen present in the inner bulb is removed and an increase of the ignition voltage of the gas discharge lamp is precluded.
A drawback of the gas discharge lamp disclosed in the above-mentioned Japanese patent specification resides in that the mounting of the hydrogen getter in the inner bulb is found to be disadvantageous in practice since the space available for welding the capsule to the inner wall of the inner bulb is small. In addition, there is a risk that impurities are introduced into the inner bulb, while the material to be used with the hydrogen getter must be resistant to aggressive gas filling components and not allow passage of these components.
It is an object of the invention to obviate the above-mentioned drawbacks of the prior art by providing, in particular, a gas discharge lamp with an efficient hydrogen getter, which can be mounted in a simple manner without the risk of impurities being introduced into the inner bulb, and without high material requirements being imposed as regards said resistance to and imperviousness to aggressive gas filling components.
To achieve this, a high-pressure gas discharge lamp of the type mentioned in the opening paragraph is characterized in accordance with the invention in that the hydrogen getter is provided in the interspace between the inner bulb and the outer bulb. Preferably, the wall that is pervious to hydrogen is formed by a capsule, while said wall is secured, in particular, to the stem of the lamp onto which the inner bulb is also mounted in general. In a further preferred modification, the wall that is pervious to hydrogen is secured to the inner wall of the outer bulb by means of welding. By virtue thereof, it is possible to efficiently mount the hydrogen getter outside the inner bulb forming the discharge vessel. During the service life of the lamp, the hydrogen getter situated in the interspace between the inner bulb
and the outer bulb efficiently "captures" hydrogen originating from materials present in the interspace, which hydrogen would normally diffuse through the inner bulb into the discharge vessel with all its adverse consequences, and it also efficiently captures hydrogen originating from the wall of the inner bulb. In other words, the hydrogen getter serves to control the hydrogen pressure in the inner bulb during the service life of the lamp, said hydrogen getter removing the above-mentioned external hydrogen source in the interspace and absorbing (part of the) hydrogen from (the wall of) the inner bulb. It goes without saying that the hydrogen getter in question does not come into contact with possibly aggressive gas filling components and hence does not have to be resistant to such components. By virtue thereof, other hydrogen getter materials that are, in particular, cheaper than those used in the prior art can be employed.
In a preferred embodiment of a high-pressure gas discharge lamp in accordance with the invention, the wall that is pervious to hydrogen is at least predominantly made of quartz. In a further preferred modification, the wall that is pervious to hydrogen is at least substantially made of a ceramic material, for example aluminum(tri)oxide, or of a metal, such as niobium. In principle, any material that is pervious to hydrogen can be used.
It is to be noted that the wall that is pervious to hydrogen, in particular the capsule, also has the following functions. First of all, this wall (capsule) precludes that gas, such as nitrogen, present in the interspace between the inner bulb and the outer bulb can damage or destroy the getter material, while, on the other hand, the wall (capsule) makes sure that material from a holder of the getter material that evaporates as a result of the high operating temperature of the lamp does not enter the interspace, thereby precluding unacceptable blackening of internal lamp components, such as the walls of the inner and outer bulbs. The protection of the getter material by the wall that is pervious to hydrogen (capsule) enables getter materials and/or additional gases other than those customarily used to be employed.
In a further preferred embodiment of a high-pressure gas discharge lamp in accordance with the invention, the wall that is pervious to hydrogen comprises at least one perforation. In a further preferred modification, the wall that is pervious to hydrogen is porous and/or thinner than existing walls. Surprisingly it has been found that this does not only lead to a substantial increase of the getter rate, but also the functions, explained above, of the wall that is pervious to hydrogen (capsule) are not adversely affected, particularly as regards damage to the getter material by the presence of nitrogen, of course in dependence upon the degree of perviousness.
As indicated hereinabove, the invention also relates to a method of manufacturing a high-pressure gas discharge lamp, wherein use is made of an inner bulb that forms a discharge vessel that is filled with a gas filling and provided with electrodes between which, during operation, a discharge takes place, and wherein use is also made of an outer bulb provided around the inner bulb so as to form an interspace, while using a hydrogen getter comprising a getter material surrounded by a wall that is pervious to hydrogen, characterized in that the hydrogen getter is arranged in the interspace between the inner bulb and the outer bulb.
The invention is further explained by means of a Figure shown in a drawing, in which a preferred embodiment of a high-pressure gas discharge lamp is diagrammatically shown.
In the Figure, a tubular, quartz glass inner bulb, i.e. discharge vessel 1, of a metal halide vapor discharge lamp in accordance with the invention is shown. At the ends of the discharge vessel 1, tungsten electrodes 2, 3 are provided which are passed through pinches 6, 7 of the discharge vessel 1 in a vacuumtight manner by means of molybdenum foils 4, 5. The inner bulb, or discharge vessel 1, is accommodated in a diagrammatically shown glass outer bulb 8 and provided with an amount of mercury that evaporates completely during operation of the lamp, and said inner bulb additionally comprises a small quantity of argon as the starting gas, as well as iodides of sodium, thallium and indium. The internal diameter of the inner bulb 1 is 15 mm, and the distance between the electrodes 2, 3 is 41 mm. The lamp is intended for a power of 400 W. Outside the discharge vessel 1, i.e. in the interspace 9 between the inner bulb 1 and the outer bulb 8, a hydrogen getter 10 is provided, which is depicted on an enlarged scale for clarity. Said getter 10 comprises a sealed yet pervious to hydrogen capsule 11 of quartz which is secured on the stem 12 of the lamp on which also the inner bulb 1 is mounted. The actual getter material 13 is present in the capsule 11. Hydrogen present in the interspace 9 is absorbed by the getter material 13 via diffusion through the capsule 11 that is pervious to hydrogen. It will be clear that the capsule 11 is not in contact with aggressive gas filling components in the inner bulb 1 , so that the capsule does not have to be resistant to these components and does not have to be impervious to these components, as is the case in the prior art.
It is to be noted that the invention is not limited to the embodiment described herein but also includes other preferred modifications that fall within the scope of the appended claims.
Claims
1. A high-pressure gas discharge lamp comprising an inner bulb forming a discharge vessel filled with a gas filling and provided with electrodes between which, during operation, a discharge takes place, and comprising an outer bulb provided around the inner bulb so as to form an interspace, a hydrogen getter comprising a getter material surrounded by a wall that is pervious to hydrogen being provided, characterized in that said hydrogen getter is arranged in the interspace between the inner bulb and the outer bulb.
2. A high-pressure gas discharge lamp as claimed in claim 1 , wherein the wall that is pervious to hydrogen is formed by a capsule.
3. A high-pressure gas discharge lamp as claimed in claim 1 or 2, wherein the wall that is pervious to hydrogen is secured to the stem of the lamp.
4. A high-pressure gas discharge lamp as claimed in claim 1, 2 or 3, wherein the wall that is pervious to hydrogen is manufactured at least predominantly from quartz, ceramic or metal.
5. A high-pressure gas discharge lamp as claimed in any one of the claims 1 through 4, wherein the wall that is pervious to hydrogen comprises at least one perforation.
6. A method of manufacturing a high-pressure gas discharge lamp, wherein use is made of an inner bulb that forms a discharge vessel that is filled with a gas filling and provided with electrodes between which, during operation, a discharge takes place, and wherein use is also made of an outer bulb provided around the inner bulb so as to form an interspace, while using a hydrogen getter comprising a getter material surrounded by a wall that is pervious to hydrogen, characterized in that the hydrogen getter is arranged in the interspace between the inner bulb and the outer bulb.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01202950 | 2001-08-03 | ||
| EP01202950.0 | 2001-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003015126A1 true WO2003015126A1 (en) | 2003-02-20 |
Family
ID=8180748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2002/003255 WO2003015126A1 (en) | 2001-08-03 | 2002-08-02 | High-pressure discharge lamp and method of manufacturing it |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2003015126A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007148281A2 (en) * | 2006-06-19 | 2007-12-27 | Koninklijke Philips Electronics N.V. | Discharge lamp |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3737710A (en) * | 1972-07-13 | 1973-06-05 | Gte Sylvania Inc | High pressure electric discharge device with getter of barium perioxide and copper |
| US4004171A (en) * | 1975-04-01 | 1977-01-18 | U.S. Philips Corporation | Gas-and/or vapor discharge lamp |
| JPS52103879A (en) * | 1976-02-25 | 1977-08-31 | Toshiba Corp | Metallic vapor discharge lamp |
| GB1505447A (en) * | 1975-11-24 | 1978-03-30 | Philips Ltd | Highpressure gas discharge lamp |
| JPS5394468A (en) * | 1977-01-31 | 1978-08-18 | Toshiba Corp | Metal vapor discharge lamp |
| JPS5431979A (en) * | 1977-08-16 | 1979-03-09 | Toshiba Corp | Metal halide lamp |
| US4203049A (en) * | 1977-06-27 | 1980-05-13 | U.S. Philips Corporation | Electric lamp with hydrogen getter and hydrogen getter |
| FR2559952A1 (en) * | 1984-02-02 | 1985-08-23 | Gen Electric | Getter in porous nickel tubing binds hydrogen |
| GB2154054A (en) * | 1984-02-02 | 1985-08-29 | Gen Electric | Getter devices |
| EP0360927A1 (en) * | 1988-09-30 | 1990-04-04 | Gte Sylvania N.V. | Improved high vacuum lamp and getter means used to this end |
| JPH04233153A (en) * | 1990-12-28 | 1992-08-21 | Matsushita Electron Corp | Both-base type high pressure sodium lamp |
-
2002
- 2002-08-02 WO PCT/IB2002/003255 patent/WO2003015126A1/en not_active Application Discontinuation
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3737710A (en) * | 1972-07-13 | 1973-06-05 | Gte Sylvania Inc | High pressure electric discharge device with getter of barium perioxide and copper |
| US4004171A (en) * | 1975-04-01 | 1977-01-18 | U.S. Philips Corporation | Gas-and/or vapor discharge lamp |
| GB1505447A (en) * | 1975-11-24 | 1978-03-30 | Philips Ltd | Highpressure gas discharge lamp |
| JPS52103879A (en) * | 1976-02-25 | 1977-08-31 | Toshiba Corp | Metallic vapor discharge lamp |
| JPS5394468A (en) * | 1977-01-31 | 1978-08-18 | Toshiba Corp | Metal vapor discharge lamp |
| US4203049A (en) * | 1977-06-27 | 1980-05-13 | U.S. Philips Corporation | Electric lamp with hydrogen getter and hydrogen getter |
| JPS5431979A (en) * | 1977-08-16 | 1979-03-09 | Toshiba Corp | Metal halide lamp |
| FR2559952A1 (en) * | 1984-02-02 | 1985-08-23 | Gen Electric | Getter in porous nickel tubing binds hydrogen |
| GB2154054A (en) * | 1984-02-02 | 1985-08-29 | Gen Electric | Getter devices |
| EP0360927A1 (en) * | 1988-09-30 | 1990-04-04 | Gte Sylvania N.V. | Improved high vacuum lamp and getter means used to this end |
| JPH04233153A (en) * | 1990-12-28 | 1992-08-21 | Matsushita Electron Corp | Both-base type high pressure sodium lamp |
Non-Patent Citations (4)
| Title |
|---|
| DATABASE WPI Section Ch Week 197741, Derwent World Patents Index; Class L03, AN 1977-73374Y, XP002222152 * |
| DATABASE WPI Section Ch Week 197838, Derwent World Patents Index; Class L03, AN 1978-67971A, XP002222153 * |
| PATENT ABSTRACTS OF JAPAN vol. 003, no. 053 (M - 058) 8 May 1979 (1979-05-08) * |
| PATENT ABSTRACTS OF JAPAN vol. 016, no. 582 (E - 1300) 22 December 1992 (1992-12-22) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007148281A2 (en) * | 2006-06-19 | 2007-12-27 | Koninklijke Philips Electronics N.V. | Discharge lamp |
| WO2007148281A3 (en) * | 2006-06-19 | 2008-08-21 | Koninkl Philips Electronics Nv | Discharge lamp |
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