Ceramic arc tube with internal ridge
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United States of America Patent
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Apr 25, 2006
Grant Date -
Mar 25, 2004
app pub date -
Sep 19, 2002
filing date -
Sep 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ceramic arc tube for a metal halide discharge lamp is described wherein the lower end well of the arc tube has an internal barrier ridge which substantially prevents migration of the metal halide condensate into the central region of the discharge chamber during vertical operation. The use of the ridge reduces fluctuation in the color temperature of vertically operated lamps and improves efficacy.
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