EP0087745A1 - Langlebende, warmfarbige Metallhalogenid-Bogenentladungslampe - Google Patents

Langlebende, warmfarbige Metallhalogenid-Bogenentladungslampe Download PDF

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Publication number
EP0087745A1
EP0087745A1 EP83101743A EP83101743A EP0087745A1 EP 0087745 A1 EP0087745 A1 EP 0087745A1 EP 83101743 A EP83101743 A EP 83101743A EP 83101743 A EP83101743 A EP 83101743A EP 0087745 A1 EP0087745 A1 EP 0087745A1
Authority
EP
European Patent Office
Prior art keywords
phosphor
lamp
arc tube
metal halide
spectrum
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.)
Ceased
Application number
EP83101743A
Other languages
English (en)
French (fr)
Inventor
Elliot F. Wyner
Calvin W. Gungle
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 Sylvania Inc
Original Assignee
GTE Products Corp
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 GTE Products Corp filed Critical GTE Products Corp
Publication of EP0087745A1 publication Critical patent/EP0087745A1/de
Ceased legal-status Critical Current

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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
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
    • H01J61/44—Devices characterised by the luminescent material

Definitions

  • This invention relates to metal halide arc discharge lamps and more particularly to such lamps which provide a warm color temperature approximating that of incandescent lamps.
  • Metal halide arc discharge lamps comprise an arc tube containing mercury and a plurality of metal halides, usually the iodides of for example, sodium and scandium, and a starting gas such as argon. These lamps are well known and are frequently employed in commercial establishments because of their long life (about 10,000 to 20, 000 hours depending on wattage) and their high efficacy. The efficacy of lamps is usually measured in lumens/watt, and the metal halide arc lamps have efficacies in the neighborhood of 80 to 125 lumens/watt, again, depending on the wattage.
  • Yet another object of the invention is the provision of a metal halide arc discharge lamp having a low color temperature and a long life.
  • a metal halide arc discharge lamp which comprises an arc tube mounted within an outer jacket.
  • the inside surface of the outer jacket is coated with a mixture of phosphors which selectively absorb some of the blue and ultraviolet emission of the arc tube and re-emit this absorbed energy in the red region of the spectrum, thus shifting the color temperature from about 4600°K to between 3200°K - 33000K.
  • This useful shift in color temperature is accomplished by this invention without any change in the standard arc tube, its fill or its loading, thus eliminating the problems occasioned by the prior art.
  • the metal halide arc discharge lamp of FIG. 1 comprises a n.srcury containing arc tube 1 within a glass outer jacket 2.
  • the arc tube 1 contains an inert starting gas, e.g., argon, and at least the halides of sodium and scandium. Generally, the halides are the iodides.
  • the arc tube 1 is supported in the usual mount 3 and has the usual electrical connections to base 4.
  • the dotted line spectrum of FIG. 2 represents the light output of the arc tube 1, when operating. As can be seen therefrom the spectrum has strong peaks in the blue region but is relatively deficient in the red. Not shown in the spectrum is the strong peak in the ultraviolet (at 365 nm) which occurs from the mercury discharge.
  • Such an arc tube when operated in a clear glass B T37 jacket at 400 watts, has a light output of about 38410 lumens; a color temperature of about 4465°K; and a color rendering index (C.R.I.) of 63.0.
  • the lamp of the invention is formed by applying to the interior surface of jacket 2 a phosphor coating 5.
  • the phosphor coating 5 comprises a mixture of a first phosphor which absorbs radiation in the blue region and emits in the red; and a second phosphor which absorbs radiation in the ultraviolet and also emits in the red.
  • the mixture comprises from 40 weight percent to 60 weight percent of the first phosphor with the balance being the second phosphor.
  • the preferred range is 50% of each phosphor.
  • the first phosphor is a manganese activated magnesium fluorogermanate (Mg 4 (F) Ge0 6 : Mn) (Sylvania type 236 or 2361) and the second phosphor is europium activated yttrium orthovanadate (YV0 4 : Eu) (Sylvania type 2390 or 2391).
  • the preferred mixture includes 1.5 grams of each phosphor.
  • the spectrum of the lamp employing phosphor coating 5 is shown by the solid line in FIG. 2.
  • the differences between the two spectra are clearly apparent and show the additional emission peaks in the red region (at about 620 nm and 658 nm) with a concurrent suppression of the blue emission.
  • the overall result provides a lamp color temperature of about 3266°K and a marked improvement in color rendering with a C.R.I. of 74.9. There is a slight but tolerable drop in lumens to about 36820.
  • a metal halide arc discharge lamp having a desirable, low color temperature and.high C.R.I. The result is accomplished without disturbing the complicated, but proven, chemistry of a conventional metal halide arc tube, and the typical life expectancies of such lamps are maintained.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
EP83101743A 1982-03-01 1983-02-23 Langlebende, warmfarbige Metallhalogenid-Bogenentladungslampe Ceased EP0087745A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US35313882A 1982-03-01 1982-03-01
US353138 1982-03-01

Publications (1)

Publication Number Publication Date
EP0087745A1 true EP0087745A1 (de) 1983-09-07

Family

ID=23387923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101743A Ceased EP0087745A1 (de) 1982-03-01 1983-02-23 Langlebende, warmfarbige Metallhalogenid-Bogenentladungslampe

Country Status (3)

Country Link
EP (1) EP0087745A1 (de)
JP (1) JPS58158854A (de)
CA (1) CA1207005A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7573072B2 (en) * 2004-03-10 2009-08-11 Lumination Llc Phosphor and blends thereof for use in LEDs

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2928257B2 (ja) * 1988-12-07 1999-08-03 松下電子工業株式会社 メタルハライドランプ
JP2928262B2 (ja) * 1989-03-16 1999-08-03 松下電子工業株式会社 メタルハライドランプ

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7920189A (nl) * 1978-12-28 1980-10-31 Mitsubishi Electric Corp Metaaldamp-ontladingslamp.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4517040Y1 (de) * 1966-12-12 1970-07-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7920189A (nl) * 1978-12-28 1980-10-31 Mitsubishi Electric Corp Metaaldamp-ontladingslamp.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JAPANESE PATENTS REPORT, vol. 76, no. 1, week X01, Part I - Chemical, & JP - A - 75 039 629 (HITACHI LTD.) 18-12-1975 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7573072B2 (en) * 2004-03-10 2009-08-11 Lumination Llc Phosphor and blends thereof for use in LEDs

Also Published As

Publication number Publication date
JPS58158854A (ja) 1983-09-21
CA1207005A (en) 1986-07-02

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19830223

AK Designated contracting states

Designated state(s): BE DE FR GB NL

STAA Information on the status of an ep patent application or granted ep patent

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18R Application refused

Effective date: 19880202

APAF Appeal reference modified

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RIN1 Information on inventor provided before grant (corrected)

Inventor name: WYNER, ELLIOT F.

Inventor name: GUNGLE, CALVIN W.