Try 24 V light bulbs, they could survive 20-40V for quite a while.
Heavy trucks use(d?) 24V, so they should be readily available,
and replacing one every now and then should be cheap.



On Aug 2, 8:13 am, Akka wrote:
We have a 15 horsepower Mercury (actually, Mariner) outboard for our
RIB. We sometimes use it at night, and want to mount an all-around
white light on the motor. The motor outputs 20-40 V non-rectified,
non-regulated power. We're afraid we'll simply blow out any bulbs
intended for 12-volt use. Short of buying a voltage regulator (way
too expensive), is there any solution to this problem?

Rob