I like it, it's different
That is a halogen light, correct?
If so, I don't see why no one can figure out how to get a halogen light to run off the mag, you just have to connect the positive to the positive, and the negative to the negative (or ground).
An HID Light is a different story all together, a battery would be required for the start up, and it needs a constant voltage to work properly...
for anyone who's looking for a cheap source for projector lights, try a fog light from an Oldsmobile Alero, or any Blazer Projector fog light for that matter, they use an 894 bulb that uses 37 watts or so, easily powered off the magneto.