Compact high-pressure discharge lamp with a fill including cadmi

Details Compact high-pressure discharge lamp with a fill including cadmi Compact high-pressure discharge lamp with a fill including cadmi

1986-02-13

1987-08-11

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

313639, 313640, H01J 6120, H01J 6138

Patent

active

046864199

ABSTRACT:
A metal halide high-pressure discharge lamp has a discharge vessel of comt construction, with a fill of mercury, at least one noble gas, typically argon, and a metal halide, with an excess of halogen. The halogen component of the metal halide is formed by iodine and/or bromine. An average light density in excess of 30 ksb, with a specific arc power of between 400 to 5000 W/cm is obtained over an average lifetime of 250 hours with a color rendering index Ra of at least 85 by utilizing cadmium and lithium as the metal component in the metal halide of the fill. Preferably, holmium also is used as a metal for the metal halide, the fill including between 0.1 and 5 mg cadmium, up to 0.05 mg lithium, and 0.05 to 1 mg holmium in a preferred form, halogen and bromine being present in a mol relation of between 0.5 to 2 within the discharge vessel. The excess halogen may be up to about 35 micromol per cubic centimeter of volume of the discharge vessel. The lamp is particularly suitable for optical projection systems, for example for combination with a reflector (13).

REFERENCES:
patent: 3654506 (1972-04-01), Kuhl et al.
patent: 4138621 (1979-02-01), Downing et al.
patent: 4243906 (1981-01-01), Wilson
patent: 4290097 (1981-09-01), Block et al.
Lamps and Lighting, Third Edition, M. A. Cayless and A. M. Marsden.

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