I would think that vibration would be more of a problem with bulbs that
have a filament. Since all fluorescents are DC and are coverted
internally to AC (or not), I would be wondering if the voltage variation
is attacking them. I'll bet the capacitors don't like a range of
probably 11.8v to possibly 14.6 volts. That's what my Progressive
Dynamics charger/converter puts out and the high end was the cause of
many of my LEDs to die a slow death. The LED vendors now say they have
put a thingy in there to stop the high end danger, so you might give
them a try instead. My later ones are still going strong.
The bulb manufacturers should know what their design range is, although
you may have to ask them in Chinese.........
Daisy ( back in the saddle !)
-----Original Message-----
> My '65 Streamline has a dual 12V/110V lighting system. In most of the
> fixtures, there are twin bulb holders, one DC and the other AC.
>
> Recently, I replaced my existing light bulbs, both 12V and 110V with spiral
> light bulbs. Already however, one of each type of bulb has died.
>
> Are these spiral bulbs subject to failure due to trailer vibration maybe?
> Anyone know?
>
> -Tom