High-pressure metal halide lamp having three part electrode rods
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United States of America Patent
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-
Jan 2, 2001
Grant Date -
N/A
app pub date -
Oct 9, 1998
filing date -
Feb 24, 1997
priority date (Note) -
Expired
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Abstract
A high-pressure metal halide discharge lamp has opposed tungsten electrodes carried by electrode rods. These rods have a first portion of tungsten adjacent the electrodes and a second portion made of at least 25% by weight of rhenium. Their common boundaries are at a location having an operating temperature in the range of 1900-2100.degree. K. The gas filling contains metal oxyhalide and is devoid of rare earth metal compounds.
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