> Interesting question posed the other day regarding some faults that
> have been detected lately. If a globe (Running on 12VDC) fails and the
> glass goes black, what has occurred? Is it overheat? Is it
> overcurrent? Is breakdown in the inert gas? Is it a failure at startup
> high current inrush (Thermal shock)? or Is it a mix of all?
> Ideas:-? Etc

Yes interesting. Just replaced a 12V 55W halogen lamp in in my
car yesterday. The guy at the shop said it looked like overvoltage
because of the way the filament had broken in one place, the
broken ends had melted into tiny blobs, and the glass was still
clear.

Sounds like a great opportunity to get a box of lamps, (globes, light
bulbs, incandescent illuminatory thingies, whatever) and test them
to destruction under a variety of conditions.


Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile: 025 334 069
eMail:  brent.brown@clear.net.nz

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