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In message <199801142102.NAA13227@mail2.exodus.net> Frank Amoroso writes:

> ...   Another friend ran higher wattage 9004's in his MB 190 
> and the bulb exploded in the light assembly.

A typical consequence of handling a quartz envelope with bare fingers.
Grease from human skin etches into quartz bulbs - the result looks a little 
like an old PF1 flashbulb after it's gone off.
I buy my H4 bulbs (100/170s) in sealed boxes of ten.  Single spare bulbs I 
always wash in alcohol before using.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club