Metal halide lamp maintaining a high lumen maintenance factor over an extended operation period
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United States of America Patent
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Aug 4, 1992
Grant Date -
N/A
app pub date -
Feb 7, 1990
filing date -
Feb 7, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A prescribed amount of tin halide is sealed in the arc tube of a metal halide lamp wherein a given amount of metal halide including a target amount of halogen and at least a predetermined amount of rare earth metal is sealed in the arc tube thereof to maintain a high lumen maintenance factor for an extended operation period. The prescribed amount of tin halide is preferably within 4.6.about.234 mol % of the predetermined amount of rare earth metal.
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