has anyone tried building an LED lamp to be powered by the old Sturmey-Archer Dynohub? I found one in fantastic condition and ,ahem, fried one of my LED front lights on an, ah, test ride. I'm figuring now that I definitely need a bridge rectifier and maybe some batteries as a kind of voltage sink. Can I just rig it up with about the right number of LEDs in series to accommodate the voltages which I expect to get out of it?
Lamps designed for dynamos (like B&M Lumotec) have built-in voltage limiting circuitry (zener diode?), which really does work. You may be able to cannibalise a B&M lamp - the basic Lumotecs are quite cheap.
