High-pressure discharge lamp
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United States of America Patent
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Nov 20, 2007
Grant Date -
Jan 13, 2005
app pub date -
May 7, 2004
filing date -
May 9, 2003
priority date (Note) -
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Abstract
A high-pressure discharge lamp has a lamp bulb of silica glass encapsulating mercury, an inactive gas, and a mixed halogen gas containing at least two halogen gases, and at least a pair of electrodes disposed in the lamp bulb in confronting relation to each other. The type and content of a primary halogen gas whose content is the greatest in the mixed halogen gas are determined based on a bulb wall load.
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