Metal halide lamp with rhenium skin on tungsten electrode

Details Metal halide lamp with rhenium skin on tungsten electrode Metal halide lamp with rhenium skin on tungsten electrode

1998-02-18

2000-05-09

Patel, Nimeshkumar D.

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313633, 313567, H01J 1704

Patent

active

060608293

ABSTRACT:
The high-pressure metal halide discharge lamp has opposite tungsten electrodes (5) carried by electrode rods (7). These rods (7) have a first portion (71) of tungsten adjacent the electrodes (5) and a second portion (72) having a core of tungsten and a skin of at least 90% by weight of rhenium. Their common boundaries are at a location having during operation a temperature in the range of 1900-2100 K. The gas filling contains metal oxyhalide and is devoid of rare earth metal compounds. The lamp has a long life and a high luminous maintenance.

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patent: 5424609 (1995-06-01), Geven et al.
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patent: 5510675 (1996-04-01), Bunk et al.
patent: 5592049 (1997-01-01), Heider et al.
patent: 5614787 (1997-03-01), Kawai et al.

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