Metal halide high pressure discharge lamp

Details Metal halide high pressure discharge lamp Metal halide high pressure discharge lamp

2008-01-15

2008-01-15

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

C313S638000, C313S639000, C313S640000, C313S641000

Reexamination Certificate

active

07319294

ABSTRACT:
In the metal halide high-pressure discharge lamp for stage, film and television lighting systems and for projection technology and effect lighting, the discharge vessel contains dysprosium and cesium as fill metals for the metal halides. Optimum results for dimmability, arc instability and color rendering are achieved if the fill additionally includes 0.12 to 3.8 μmol of vanadium and if appropriate 0.05 to 1.0 μmol of zirconium per ml of vessel volume. These metals achieve improved color rendering, in particular red rendering, with an Ra of from 70 to 95 and an R9of from 45 to 90.

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