Metal halide lamp for automobile headlight
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United States of America Patent
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-
Oct 26, 2004
Grant Date -
Sep 25, 2003
app pub date -
Nov 25, 2002
filing date -
Mar 30, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A metal halide lamp for an automobile headlight is provided, which includes an arc tube in which a pair of tungsten electrodes are provided at both ends and a metal halide as a main component of a luminescent material and xenon gas as a buffer gas are sealed, wherein the tungsten electrodes contain not more than 0.4 wt % of thorium oxide, the metal halide contains scandium iodide, and a pressure of the xenon sealed in the arc tube is at least 0.4 MPa. This makes it possible to provide a long-life metal halide lamp for an automobile headlight that can achieve a further improved lumen maintenance factor and other life characteristics during 2000 hours or more of lighting.
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