This doesn't quite come under "low cost" but if
you only run one battery in your van and are afraid
of draining it too much, why not look into the various
LED lighting possibilities?  They are tremendously
efficient, don't heat up, and won't drain your battery
if you leave them on all night.

Not as cheap as $10 fluorescents from home despot though.

tabe johnson/87 westy

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