RE: headlamp bulbs (devitrifying)

["Smith, Kirby A" <kirby.a.smith@lmco.com>]

Other causes of failure include:

	Tungsten evaporation onto the quartz envelope; this leads to
increased light absorption and eventual thermal failure.

	Bad reflector design; this causes  energy to be reflected back onto
the envelope.

                .... Kirby   (Kirby A. Smith)
                              2 x 1988 90q
                          New Hampshire USA



> In message  "Smith, Kirby A" writes:
> > For us Audiites, this applies to the present
> > technology head lamp bulbs.
> 
>  Phil Payne replied:
> 
> Let me ask the question another way - has anyone seen such envelope damage
> that _wasn't_ caused by greasy fingerprints?
> 
> --
>