Metal halide discharge lamp
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 28, 2003
Grant Date -
N/A
app pub date -
Mar 27, 2000
filing date -
Mar 26, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A metal halide discharge lamp which is capable of reducing a color change when subjected to a variation in the lamp power and/or the voltage supplied to the lamp. The metal halide lamp has an arc tube filled with at least sodium halide and scandium halide. The arc tube is formed at its opposite ends with electrodes which gives an arc discharge therebetween. The lamp has regulator means for keeping a coldest spot temperature of the arc tube at 550.degree. C. or more when operating the lamp at a lamp power which is 50% or rated lamp power. It is found that when the lamp is configured to have a coldest spot temperature at 550.degree. C. or more when operating the lamp at a lamp power which is 50% of the rated lamp power, the lamp shows much less color variation even subjected to the lamp voltage variation, thereby maintaining a desired color.
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