Here are some with the larger heads that I haven't
tried making a mounting plug for. My move got in the
way of my experimenting.
These really light up the back of the truck but the head won't
fit in the bed roll:
http://www.pbase.com/dennygraham/image/152903544 The head from the smaller ones like Jerry was talking about can
be squeeze into a PVC pipe reducer by turning them in a bench
lathe:
http://www.pbase.com/dennygraham/image/122737145Voltage wise they all run off of 4.5vdc battery current. All you
have to do is put a small dropping resistor in series with them
to get rid of the extra 7.5v from your 12v system or drop 1.5v
in your 6v system. I just used some 1/2w resistors from Rat
Shack that I had on the shelf, can't recall what the resistance
was now, all of that was lost when the confuser crashed last
year.
DG