High pressure metal halide lamp

Details High pressure metal halide lamp High pressure metal halide lamp

1997-03-12

1998-12-01

Patel, Nimeshkumar

Electric lamp and discharge devices

With gas or vapor

Electrode composition

313631, 313632, 313637, 313638, H01J 6173

Patent

active

058443657

ABSTRACT:
A light transmitting discharge vessel encloses a discharge space, sealed in a gas-tight manner, in which electrodes connected to current conductors which extend to the exterior are disposed. A filling in the discharge vessel comprises a rare gas, a buffer gas and at least one transition metal halide chosen from the halides of hafnium, zirconium and tantalum. Each of the electrodes comprises an electrode part containing a carbide chosen from the carbides of hafnium, zirconium and tantalum. As a result diffusion of transition metal from the plasma into the electrode is strongly suppressed so that the lamp keeps very good color rendering properties throughout its operation.

REFERENCES:
patent: 3911309 (1975-10-01), Kummel et al.
patent: 4002940 (1977-01-01), Ekkelboom et al.

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