Metal halide lamp with rhenium skin on tungsten electrode
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United States of America Patent
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-
May 9, 2000
Grant Date -
N/A
app pub date -
Feb 18, 1998
filing date -
Feb 24, 1997
priority date (Note) -
Expired
status (Latency Note)
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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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