Miata Mailing List: March 1999, Message #3737

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I replaced the factory bulbs in my '99 a while back.  I put in the PIAA
Superwhite.  After a short period of time the low beam on the driver's side
burned out.  I put the factory bulbs back in.  They really aren't that
effective, so I bought another set of PIAA, a different wattage, from a
different vendor.  After a couple of weeks the low beam on the driver's side
burned out again.  Once again I put the factory bulbs back in.  Both times I
was very careful not to touch the bulb when installing it.

Does this indicate something I can trace or fix, or should I try a bulb from
a different manufacturer?  The box says H4.  Will any H4 replacement bulb
work?  Do any vendors have a drastically better price than others?

Thanks
Mike