Dynamo conversion. This is a cheap way to power a 6v lamp without the use of a wheel dynamo. All you need is a 6v [4 cell] battery holder from Radioshack and some wire.

The only thing you have to do is solder a wire to the bulb ground. Basically solder a wire from the battery pack to where the end of the bulb sits when installed. The other wire goes from the pack to the bulb like normal. Pics should help explain.

And you have light!

I still have to install the on/off switch then everything can get mounted onto my front rack. No more resistance and humming from a wheel dynamo!