US3654506A - High pressure mercury vapor discharge lamp with metal halide additive - Google Patents

High pressure mercury vapor discharge lamp with metal halide additive Download PDF

Info

Publication number
US3654506A
US3654506A US58292A US3654506DA US3654506A US 3654506 A US3654506 A US 3654506A US 58292 A US58292 A US 58292A US 3654506D A US3654506D A US 3654506DA US 3654506 A US3654506 A US 3654506A
Authority
US
United States
Prior art keywords
lamp
high pressure
pressure mercury
mercury vapor
vapor discharge
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.)
Expired - Lifetime
Application number
US58292A
Inventor
Bernard Kuhl
Alexander Dobrusskin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Application granted granted Critical
Publication of US3654506A publication Critical patent/US3654506A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01J61/827—Metal halide arc lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/125—Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component

Definitions

  • ABSTRACT High pressure mercury vapor discharge lamp without outer jacket and with a wall loading of between and 100 W/cm preferably -60 W/cm and a medium arc length corresponding to a load per cm of arc length of between and 1000 W/cm, preferably -850 W/cm.
  • the type of lamp which is chiefly used for general lighting purposes such as, for instance, street lighting is a development of the high pressure mercury vapor discharge lamps. It comprises a tubular discharge vessel of quartz glass with one leadin wire each sealed or pinch-sealed into each end. The spacing of the electrodes is approximately 50 mm. The wall loading of such lamps is about 10 W/cm.
  • the vessel is filled, besides mercury and a starting gas, mostly with the halides, preferably the iodides, of sodium and thallium; rare-earth metals like dysprosium, holmium, erbium or thulium (see US. Pat. No. 3,536,947; US. Pat. No.
  • the discharge vessel the so-called arc tube
  • the discharge vessel is enclosed in a single-ended outer envelope, which is exhausted or filled with gas in order to reduce heat losses.
  • the lamps have a luminous efficiency of over 50 lm/W, and mostly below 801m/W; and a life of several 1,000 hours.
  • the lamps of the other type are used for projection purposes and in signaling and they are, with regard to their field of application, a further development of the high pressure xenon discharge lamps used for these purposes. They provide high luminance and have, therefore, short arcs.
  • the lamps are operated with extremely high wall loading of far more than 100 W/cm for instance with 400 to 1,000 W/cm
  • the wall thickness of the discharge vessel is from 3 to 5 mm; the spacing of the electrodes is in most cases less than mm.
  • the lamps are so-called one-component lamps and contain, besides a basic gas as the filling excitable to luminance, the halides, for instance, of indium or gallium or aluminum; in addition, mercury is often used as a buffer gas but not as an element to be excited.
  • the lamp is a high pressure mercury vapor discharge lamp with metal halide additive; it has a single wall, preferably ellipsoidal discharge vessel of heat-resisting, light-transmissive material.
  • the lamp has a wall loading of between 10 and 100 W/cm, preferably 20-60 W/cm with a load per cm of arc length between 100 and 1,000 W/cm, preferably from 150 to 850 W/cm; and the additive is composed of halides of rare-earth metals, preferably of thulium and/or holmium, and/or halide of thallium, and wherein the ratio of weight of halogen to metal is between 2 and 10. No outer envelope is used.
  • halogen compounds preferably the iodides of thulium or holmium in a quantity of from 0.25 to 11 mg/cm, preferably from 0.5 to 4 mg/cm when filled into the discharge vessel are advantageous.
  • An excess of iodine of up to 50 percent of the quantity of iodine equivalent to the rare-earth metals is necessary to ensure the halogencycle process and thus long lamp life.
  • a thulium iodide additive a high color rendition index of about 92 is obtained with a color temperature of 6,000 K which renders the lamp particularly suitable for color television and color photography.
  • the discharge tube 1 is of quartz glass which contains only little hydrogen and can be coated inside with a protective layer 2, preferably of boron oxide.
  • the maximum inner diameter of the discharge vessel is 15 mm, the volume 2.3 cm
  • Each end of the discharge vessel is provided with a rod-shaped nonactivated tungsten electrode 3, 4, having a diameter of 0.9 mm. Electrode spacing is 12 mm.
  • the ends of the discharge vessel are provided with a reflecting coating 5.
  • the bases 6 and 7 are connected to a voltage source; operating voltage is approximately 80 V, current approximately 7.5 amps.
  • the filling of the discharge vessel 1 consists of a basic gas as starting aid, for instance, argon at a pressure of 50 torr; and 1.5 mg of thulium, 4 mg of mercury and 7 mg of HgJ the ratio of weight of iodine to thulium being 2.3.
  • the mercury iodide reacts in the discharge vessel with thulium according to the formula
  • the structural datas and the fill quantities are applicable to a lamp of 500 W power input.
  • the luminous flux is 45 klm, the luminous efficiency 901m/W, the color temperature 6,000 K, the chromaticity coordinates x/y 0.32/0.32, the color rendition index 92.
  • Lamps having a power input of 600 W had a luminous efficiency of lm/W.
  • Lamps having a power input of 5 kW had a luminous efficiency of lm/W.
  • High pressure mercury vapor discharge lamp comprising a single, unenclosed envelope of heat-resisting light-transmissive material forming a discharge vessel;
  • the discharge vessel further containing from 0.25 to 11 mg/cm of a halide of the rare-earth metals,
  • the load per cm of 5 earth metal comprises a halide of thulium or holmium.
  • Lamp according to claim 1 wherein the additive is thallium iodide.
  • Lamp according to claim I wherein the lamp envelope is ellipsoidal in shape.

Landscapes

  • Discharge Lamp (AREA)

Abstract

High pressure mercury vapor discharge lamp without outer jacket and with a wall loading of between 10 and 100 W/cm2 preferably 20-60 W/cm2 and a medium arc length corresponding to a load per cm of arc length of between 100 and 1000 W/cm, preferably 150-850 W/cm. Additives of thallium halide and halides of rare-earth metals, preferably of thulium and holmium, in a ratio of weight of halogen to metal between 2 and 10. Color temperature is 6,000* K, index of color rendition 92.

Description

United States Patent Kiihl et al.
Dobrusskin, Tauikirchen, both of Germany latent-Treuhand-Gesellschaft, fur elektrische Glul'ilampen mbll, Munich, Germany [22] Filed: July 27,1970
[21] Appl.No.: 58,292
[73] Assignee:
[30] Foreign Application Priority Data Aug. 8, 1969 Germany ..P 19 40 539.1
[52] US. Cl ..313/184, 313/225, 313/229 [51] Int. Cl. ..H01j 61/12 [58] Field of Search ..313/229,184, 225
[451 Apr. 4, 1972 Primary Examiner-Roy Lake Assistant Examiner-Palmer C. Demeo Attorney-Flynn and F rishauf 7] ABSTRACT High pressure mercury vapor discharge lamp without outer jacket and with a wall loading of between and 100 W/cm preferably -60 W/cm and a medium arc length corresponding to a load per cm of arc length of between and 1000 W/cm, preferably -850 W/cm. Additives of thallium halide and halides of rare-earth metals, preferably of thulium and holmium, in a ratio of weight of halogen to metal between 2 and 10. Color temperature is 6,000 K, index of color rendition 92.
6 Claims, 1 Drawing Figure Patented A ril 4, 1972 3,654,506
Dr. Bernhard KUhl Alexander Dobrusskin WVEHIOP;
W W BY ATTORNE I HIGH PRESSURE MERCURY VAPOR DISCHARGE LAMP WIT I'I METAL HALIDE ADDITIVE The invention relates to a high pressure mercury vapor discharge lamp with metal halide additive, the discharge vessel being preferably of ellipsoidal shape, and made of heat-resisting, light-transmissive material. I
Two different types of high pressure discharge lamps with metal halide filling are generally known:
1. The type of lamp which is chiefly used for general lighting purposes such as, for instance, street lighting (see for example, German Patent specification No. 1,184,008) is a development of the high pressure mercury vapor discharge lamps. It comprises a tubular discharge vessel of quartz glass with one leadin wire each sealed or pinch-sealed into each end. The spacing of the electrodes is approximately 50 mm. The wall loading of such lamps is about 10 W/cm. The vessel is filled, besides mercury and a starting gas, mostly with the halides, preferably the iodides, of sodium and thallium; rare-earth metals like dysprosium, holmium, erbium or thulium (see US. Pat. No. 3,536,947; US. Pat. No. 3,452,238) are used. The discharge vessel, the so-called arc tube, is enclosed in a single-ended outer envelope, which is exhausted or filled with gas in order to reduce heat losses. The lamps have a luminous efficiency of over 50 lm/W, and mostly below 801m/W; and a life of several 1,000 hours.
2. The lamps of the other type are used for projection purposes and in signaling and they are, with regard to their field of application, a further development of the high pressure xenon discharge lamps used for these purposes. They provide high luminance and have, therefore, short arcs. The lamps are operated with extremely high wall loading of far more than 100 W/cm for instance with 400 to 1,000 W/cm The wall thickness of the discharge vessel is from 3 to 5 mm; the spacing of the electrodes is in most cases less than mm. The lamps are so-called one-component lamps and contain, besides a basic gas as the filling excitable to luminance, the halides, for instance, of indium or gallium or aluminum; in addition, mercury is often used as a buffer gas but not as an element to be excited. An outer envelope is not necessary with these lamps (see U.S. Pat. No. 3,259,777, Dutch published Patent application 67 10 944). A projection lamp which contains scandium halide as the excitable element (see German Patent 1,177,248) is also known. The luminous efficiency of these one-component lamps is more than 90 lm/W, the useful life is several 100 hours.
It an object of the invention to provide a lamp which represents a further development of lamps of the first-mentioned type, and which at the same time, shows characteristics of the second type, for instance, with regard to luminous efficiency. Another object is the optimum dimensioning of such a lamp.
SUBJECT MATTER OF THE INVENTION:
The lamp is a high pressure mercury vapor discharge lamp with metal halide additive; it has a single wall, preferably ellipsoidal discharge vessel of heat-resisting, light-transmissive material. According to the invention, the lamp has a wall loading of between 10 and 100 W/cm, preferably 20-60 W/cm with a load per cm of arc length between 100 and 1,000 W/cm, preferably from 150 to 850 W/cm; and the additive is composed of halides of rare-earth metals, preferably of thulium and/or holmium, and/or halide of thallium, and wherein the ratio of weight of halogen to metal is between 2 and 10. No outer envelope is used.
The invention will be described by way of example with reference to the accompanying drawing wherein the single figure is a schematic longitudinal view of the lamp.
The luminous efiiciency of lamps increases with the specific loading in Watt per centimeter of arc length. With the same power input and a reduction of the electrode spacing an increase in luminous efficiency is then to be expected. Surprisingly, however, the luminous efficiency obtainable with lamps of medium electrode spacing, according to the invention, is much greater than could be expected from theoretical considerations and amounts to to 130 lm/W depending on the respective power input of the lamp, without, however, approaching the wall loading of the second type of lamp. A greater power input with lamp dimensions maintained constant implies, however, that the wall loading of the lamp rises and hence lamp life decreases. Unexpectedly, however, it has been found that compared with the above described shortare lampsa halogen cycle starts already with low wall loadings of the lamps according to the invention. This is in contrast to the known high pressure mercury vapor discharge lamps with metal halide additives in which the halogen cycle is hardly still effective. The invention shows that by choosing the specific load per cm of arc length and wall loading, it is possible to obtain a maximum of luminous efficiency far beyond that which would be expected from a mere change of dimensions. In order to obtain the halogen cycle an excess of halogen must be present in the lamp; yet, this excess must be chosen so low that the luminous efficiency is not impaired. From the high wall loading, it is obvious that the heat-accumulating outer envelope has to be omitted. This facilitates at the same time lamp manufacture and renders it less expensive. Besides, providing the lamp with bases at both ends allows the application of higher starting voltage and enables restarting of the lamp when still hot.
As an addition to mercury, halogen compounds, preferably the iodides of thulium or holmium in a quantity of from 0.25 to 11 mg/cm, preferably from 0.5 to 4 mg/cm when filled into the discharge vessel are advantageous. An excess of iodine of up to 50 percent of the quantity of iodine equivalent to the rare-earth metals is necessary to ensure the halogencycle process and thus long lamp life. When using a thulium iodide additive, a high color rendition index of about 92 is obtained with a color temperature of 6,000 K which renders the lamp particularly suitable for color television and color photography.
The discharge tube 1 is of quartz glass which contains only little hydrogen and can be coated inside with a protective layer 2, preferably of boron oxide. The maximum inner diameter of the discharge vessel is 15 mm, the volume 2.3 cm Each end of the discharge vessel is provided with a rod-shaped nonactivated tungsten electrode 3, 4, having a diameter of 0.9 mm. Electrode spacing is 12 mm. The ends of the discharge vessel are provided with a reflecting coating 5. The bases 6 and 7 are connected to a voltage source; operating voltage is approximately 80 V, current approximately 7.5 amps.
The filling of the discharge vessel 1 consists of a basic gas as starting aid, for instance, argon at a pressure of 50 torr; and 1.5 mg of thulium, 4 mg of mercury and 7 mg of HgJ the ratio of weight of iodine to thulium being 2.3. The mercury iodide reacts in the discharge vessel with thulium according to the formula The structural datas and the fill quantities are applicable to a lamp of 500 W power input. The luminous flux is 45 klm, the luminous efficiency 901m/W, the color temperature 6,000 K, the chromaticity coordinates x/y 0.32/0.32, the color rendition index 92. Lamps having a power input of 600 W, had a luminous efficiency of lm/W. Lamps having a power input of 5 kW had a luminous efficiency of lm/W.
We claim:
1. High pressure mercury vapor discharge lamp comprising a single, unenclosed envelope of heat-resisting light-transmissive material forming a discharge vessel;
a fill of rare gas forming a starting gas in said vessel;
said vessel, when the lamp is operating, having a wall loading of between 10 and 100 W/cm and a loading per cm of arc length of between 100 and 1,000 W/cm;
the discharge vessel further containing from 0.25 to 11 mg/cm of a halide of the rare-earth metals,
from 0 to 0.2 mg/cm of thallium halide,
from 2 to 10 mg/cm of mercury,
the load per cm of 5 earth metal comprises a halide of thulium or holmium.
5. Lamp according to claim 1 wherein the additive is thallium iodide.
6. Lamp according to claim I, wherein the lamp envelope is ellipsoidal in shape.

Claims (5)

  1. 2. Lamp according to claim 1 wherein the wall loading is from 20 to 60 W/cm2.
  2. 3. Lamp according to claim 1 wherein the load per cm of arc length is between 150 to 850 W/cm.
  3. 4. Lamp according to claim 1 wherein the additive of rare-earth metal comprises a halide of thulium or holmium.
  4. 5. Lamp according to claim 1 wherein the additive is thallium iodide.
  5. 6. Lamp according to claim 1, wherein the lamp envelope is ellipsoidal in shape.
US58292A 1969-08-08 1970-07-27 High pressure mercury vapor discharge lamp with metal halide additive Expired - Lifetime US3654506A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE691940539A DE1940539C3 (en) 1969-08-08 1969-08-08 Mercury vapor high pressure discharge lamp with the addition of rare earth halides

Publications (1)

Publication Number Publication Date
US3654506A true US3654506A (en) 1972-04-04

Family

ID=5742350

Family Applications (1)

Application Number Title Priority Date Filing Date
US58292A Expired - Lifetime US3654506A (en) 1969-08-08 1970-07-27 High pressure mercury vapor discharge lamp with metal halide additive

Country Status (7)

Country Link
US (1) US3654506A (en)
AT (1) AT302481B (en)
BE (1) BE754499A (en)
DE (1) DE1940539C3 (en)
FR (1) FR2056778A5 (en)
GB (1) GB1282805A (en)
SE (1) SE375408B (en)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771009A (en) * 1971-12-27 1973-11-06 Gte Laboratories Inc Electrode discharge device with electrode-activating fill
US4020377A (en) * 1975-04-30 1977-04-26 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh High pressure mercury vapor discharge lamp
US4134039A (en) * 1976-04-07 1979-01-09 Egyesult Izzolampa Es Villamossagi Reszvenytarsasag High-pressure gas discharge light source
US4161672A (en) * 1977-07-05 1979-07-17 General Electric Company High pressure metal vapor discharge lamps of improved efficacy
US4298813A (en) * 1978-10-23 1981-11-03 General Electric Company High intensity discharge lamps with uniform color
DE3110465A1 (en) * 1980-03-27 1982-01-28 ILC Technology Inc., Sunnyvale, Calif. HIGH INTENSITY LAMP WITH PRE-MADE ELECTRODE COMPONENTS
EP0128550A1 (en) * 1983-06-09 1984-12-19 GTE Products Corporation single-ended metal halide discharge lamp with minimal color separation and method of fabrication
EP0134426A1 (en) * 1983-06-09 1985-03-20 GTE Products Corporation Single-ended metal halide discharge lamp with minimal colour separation
EP0169510A2 (en) * 1984-07-24 1986-01-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Metal halide high-pressure discharge lamp
US4686419A (en) * 1985-02-22 1987-08-11 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh Compact high-pressure discharge lamp with a fill including cadmium and lithium halide
US4801846A (en) * 1986-12-19 1989-01-31 Gte Laboratories Incorporated Rare earth halide light source with enhanced red emission
FR2620267A1 (en) * 1987-09-04 1989-03-10 Philips Nv DISCHARGE LAMP IN HIGH PRESSURE GAS AND APPARATUS PROVIDED WITH SAID LAMP
EP0391283A2 (en) * 1989-04-04 1990-10-10 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Double-based high-pressure discharge lamp
EP0400980A2 (en) * 1989-05-31 1990-12-05 Iwasaki Electric Co., Ltd. Metal halide lamp
US5144201A (en) * 1990-02-23 1992-09-01 Welch Allyn, Inc. Low watt metal halide lamp
US5264760A (en) * 1990-09-24 1993-11-23 Patent-Treuhand-Gesellschaft Fur Elektrische Gluehlampen Mbh High-pressure metal halide discharge lamp with a fill containing nickel halide
US5416383A (en) * 1991-05-08 1995-05-16 Patent-Treuhand Gesellschaft Fuer Elektrische Gleuhlampen Mbh High-pressure discharge lamp and low-noise lamp operating system
EP0784334A1 (en) * 1996-01-11 1997-07-16 Osram Sylvania Inc. Metal halide lamp
US5708328A (en) * 1992-06-03 1998-01-13 General Electric Company Universal burn metal halide lamp
US5965984A (en) * 1995-10-20 1999-10-12 Matsushita Electric Industrial Co., Ltd. Indium halide and rare earth metal halide lamp
US6005356A (en) * 1996-10-21 1999-12-21 Matsushita Electric Industrial Co., Ltd. Operating method and operating apparatus for a high pressure discharge lamp
US6107742A (en) * 1997-04-03 2000-08-22 Matsushita Electronics Corporation Metal halide lamp
US6225754B1 (en) 1996-10-21 2001-05-01 Matsushita Electric Industrial Co., Ltd. Operating method and operating apparatus for a high pressure discharge lamp
US6545413B1 (en) * 1997-10-13 2003-04-08 Matsushita Electric Industrial Co., Ltd. Metal halide lamp
WO2005101455A2 (en) * 2004-04-16 2005-10-27 Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh High-pressure discharge lamp
US20080111489A1 (en) * 2006-11-09 2008-05-15 Johnston Colin W Discharge lamp with high color temperature
US20100213840A1 (en) * 2009-02-26 2010-08-26 Seiko Epson Corporation Discharge lamp and method for producing same, light source device, and projector
US9171712B2 (en) 2014-07-05 2015-10-27 National Institute Of Standards And Technology Lamp having a secondary halide that improves luminous efficiency

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2826733C2 (en) * 1977-07-05 1982-07-29 General Electric Co., Schenectady, N.Y. High pressure metal halide discharge lamp
DE3522654A1 (en) * 1985-01-21 1987-01-08 Paul Prof Dr Schulz Incandescent lamps having a high light output ration, and incandescent lamps with arc discharges

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234421A (en) * 1961-01-23 1966-02-08 Gen Electric Metallic halide electric discharge lamps
US3259777A (en) * 1961-05-09 1966-07-05 Gen Electric Metal halide vapor discharge lamp with near molten tip electrodes
US3334261A (en) * 1965-10-24 1967-08-01 Sylvania Electric Prod High pressure discharge device having a fill including iodine mercury and at least one rare earth metal
US3452238A (en) * 1966-12-05 1969-06-24 Westinghouse Electric Corp Metal vapor discharge lamp
US3536947A (en) * 1967-03-23 1970-10-27 Tokyo Shibaura Electric Co High pressure discharge lamps

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234421A (en) * 1961-01-23 1966-02-08 Gen Electric Metallic halide electric discharge lamps
US3259777A (en) * 1961-05-09 1966-07-05 Gen Electric Metal halide vapor discharge lamp with near molten tip electrodes
US3334261A (en) * 1965-10-24 1967-08-01 Sylvania Electric Prod High pressure discharge device having a fill including iodine mercury and at least one rare earth metal
US3452238A (en) * 1966-12-05 1969-06-24 Westinghouse Electric Corp Metal vapor discharge lamp
US3536947A (en) * 1967-03-23 1970-10-27 Tokyo Shibaura Electric Co High pressure discharge lamps

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771009A (en) * 1971-12-27 1973-11-06 Gte Laboratories Inc Electrode discharge device with electrode-activating fill
US4020377A (en) * 1975-04-30 1977-04-26 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh High pressure mercury vapor discharge lamp
US4134039A (en) * 1976-04-07 1979-01-09 Egyesult Izzolampa Es Villamossagi Reszvenytarsasag High-pressure gas discharge light source
US4161672A (en) * 1977-07-05 1979-07-17 General Electric Company High pressure metal vapor discharge lamps of improved efficacy
US4298813A (en) * 1978-10-23 1981-11-03 General Electric Company High intensity discharge lamps with uniform color
DE3110465A1 (en) * 1980-03-27 1982-01-28 ILC Technology Inc., Sunnyvale, Calif. HIGH INTENSITY LAMP WITH PRE-MADE ELECTRODE COMPONENTS
EP0128550A1 (en) * 1983-06-09 1984-12-19 GTE Products Corporation single-ended metal halide discharge lamp with minimal color separation and method of fabrication
EP0134426A1 (en) * 1983-06-09 1985-03-20 GTE Products Corporation Single-ended metal halide discharge lamp with minimal colour separation
EP0169510A3 (en) * 1984-07-24 1988-09-21 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Metal halide high-pressure discharge lamp
EP0169510A2 (en) * 1984-07-24 1986-01-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Metal halide high-pressure discharge lamp
US4647814A (en) * 1984-07-24 1987-03-03 Patent-Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh High-power, high-pressure metal halide discharge lamp with improved spectral light distribution
US4686419A (en) * 1985-02-22 1987-08-11 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh Compact high-pressure discharge lamp with a fill including cadmium and lithium halide
US4801846A (en) * 1986-12-19 1989-01-31 Gte Laboratories Incorporated Rare earth halide light source with enhanced red emission
FR2620267A1 (en) * 1987-09-04 1989-03-10 Philips Nv DISCHARGE LAMP IN HIGH PRESSURE GAS AND APPARATUS PROVIDED WITH SAID LAMP
NL8702086A (en) * 1987-09-04 1989-04-03 Philips Nv HIGH PRESSURE GAS DISCHARGE LAMP AND LUMINAIRE FITTED WITH THE LAMP.
EP0391283A2 (en) * 1989-04-04 1990-10-10 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Double-based high-pressure discharge lamp
EP0391283A3 (en) * 1989-04-04 1991-05-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Double-based high-pressure discharge lamp
US5138227A (en) * 1989-04-04 1992-08-11 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen M.B.H. High-pressure discharge lamp, particularly double-ended high-power, high-wall loading discharge lamp, and method of making the same
JP2831430B2 (en) 1989-04-04 1998-12-02 パテント‐トロイハント‐ゲゼルシヤフト・フユール・エレクトリツシエ・グリユーラムペン・ミツト・ベシユレンクテル・ハフツング Double-ended high-pressure discharge lamp
EP0400980A2 (en) * 1989-05-31 1990-12-05 Iwasaki Electric Co., Ltd. Metal halide lamp
EP0400980A3 (en) * 1989-05-31 1991-07-31 Iwasaki Electric Co., Ltd. Metal halide lamp
US5220244A (en) * 1989-05-31 1993-06-15 Iwasaki Electric Co. Ltd. Metal halide discharge lamp
US5144201A (en) * 1990-02-23 1992-09-01 Welch Allyn, Inc. Low watt metal halide lamp
US5264760A (en) * 1990-09-24 1993-11-23 Patent-Treuhand-Gesellschaft Fur Elektrische Gluehlampen Mbh High-pressure metal halide discharge lamp with a fill containing nickel halide
US5416383A (en) * 1991-05-08 1995-05-16 Patent-Treuhand Gesellschaft Fuer Elektrische Gleuhlampen Mbh High-pressure discharge lamp and low-noise lamp operating system
US5708328A (en) * 1992-06-03 1998-01-13 General Electric Company Universal burn metal halide lamp
US5965984A (en) * 1995-10-20 1999-10-12 Matsushita Electric Industrial Co., Ltd. Indium halide and rare earth metal halide lamp
CN1106671C (en) * 1996-01-11 2003-04-23 奥斯兰姆施尔凡尼亚公司 Metal halide lamp
EP0784334A1 (en) * 1996-01-11 1997-07-16 Osram Sylvania Inc. Metal halide lamp
US6005356A (en) * 1996-10-21 1999-12-21 Matsushita Electric Industrial Co., Ltd. Operating method and operating apparatus for a high pressure discharge lamp
US6225754B1 (en) 1996-10-21 2001-05-01 Matsushita Electric Industrial Co., Ltd. Operating method and operating apparatus for a high pressure discharge lamp
US6107742A (en) * 1997-04-03 2000-08-22 Matsushita Electronics Corporation Metal halide lamp
US6545413B1 (en) * 1997-10-13 2003-04-08 Matsushita Electric Industrial Co., Ltd. Metal halide lamp
WO2005101455A2 (en) * 2004-04-16 2005-10-27 Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh High-pressure discharge lamp
WO2005101455A3 (en) * 2004-04-16 2006-08-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High-pressure discharge lamp
US20070200504A1 (en) * 2004-04-16 2007-08-30 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhl High-Pressure Discharge Lamp
US7973482B2 (en) 2004-04-16 2011-07-05 OSRAM Gesellschaft mit beschraenkler Haftung High-pressure discharge lamp with halogens
US20080111489A1 (en) * 2006-11-09 2008-05-15 Johnston Colin W Discharge lamp with high color temperature
US7486026B2 (en) * 2006-11-09 2009-02-03 General Electric Company Discharge lamp with high color temperature
US20100213840A1 (en) * 2009-02-26 2010-08-26 Seiko Epson Corporation Discharge lamp and method for producing same, light source device, and projector
US8449343B2 (en) * 2009-02-26 2013-05-28 Seiko Epson Corporation Discharge lamp having a heat resistant film and method for producing same
US9171712B2 (en) 2014-07-05 2015-10-27 National Institute Of Standards And Technology Lamp having a secondary halide that improves luminous efficiency

Also Published As

Publication number Publication date
BE754499A (en) 1971-01-18
AT302481B (en) 1972-10-10
DE1940539C3 (en) 1979-03-08
SE375408B (en) 1975-04-14
DE1940539B2 (en) 1978-06-08
FR2056778A5 (en) 1971-05-14
DE1940539A1 (en) 1971-02-25
GB1282805A (en) 1972-07-26

Similar Documents

Publication Publication Date Title
US3654506A (en) High pressure mercury vapor discharge lamp with metal halide additive
US4171498A (en) High pressure electric discharge lamp containing metal halides
US3979624A (en) High-efficiency discharge lamp which incorporates a small molar excess of alkali metal halide as compared to scandium halide
US6265827B1 (en) Mercury-free metal halide lamp
US4020377A (en) High pressure mercury vapor discharge lamp
US3852630A (en) Halogen containing high-pressure mercury vapor discharge lamp
JP4531946B2 (en) Mercury-free metal halide lamp
JPH0349148A (en) High efficiency electrodeless highly luminous discharge lamp
JPH10144259A (en) High-pressure metal halide lamp
US3781586A (en) Long lifetime mercury-metal halide discharge lamps
US3786297A (en) Discharge lamp which incorporates cerium and cesium halides and a high mercury loading
US3911308A (en) High-pressure metal-vapor discharge lamp
US4978884A (en) Metal halide discharge lamp having low color temperature and improved color rendition
JP2003016998A (en) Metal halide lamp
US4308483A (en) High brightness, low wattage, high pressure, metal vapor discharge lamp
US3764843A (en) High-pressure gas discharge lamp containing germanium and selenium
US7573203B2 (en) Mercury-free high-pressure discharge lamp and luminaire using the same
US3714493A (en) Compact metal halide arc lamp containing primarily mercury iodide
JPS61142654A (en) High pressure halogenated metal arc discharge lamp containing xenon buffer gas
JP3388539B2 (en) Mercury-free metal halide lamp
JP3293499B2 (en) High pressure discharge lamp
US3575630A (en) High pressure mercury vapor discharge lamp containing zirconium iodide
US3569766A (en) Metal vapor discharge lamp
JP2006221928A (en) High-pressure discharge lamp
JPH02177245A (en) Metal halide discharge lamp, color rendering characteristic of which is improved