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headlight contamination
I work in the glass industry and since your bulb failed prematurely it
is probably is contamination issue. The most common problem is that
during installation you touched it with your fingers. If the oil from your
skin (even a tiny bit) gets on the surface of the quartz envelope of the
bulb it will cause the quarts glass to divitrify. Divitrification is a process
by which crystabolite is formed on the surface of the glass. This crystaline
form of quartz forms on and around the uncontaminated surface of the
quartz causes a slight difference in expansion and contraction, thus causing
cracks in the surface and throught the inside of the glass envelope letting
air into the filament. When air gets to the filament the wire burns hotter
and hotter until it burns itself apart. And thus, your bulb fails. So, to summarize, do not ever touch the surface of the quartz glass envelope
that your bulb is made with.
Best regards and good luck.
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