Ever since I built my motorized bike 2 years ago I have experimented with LED based light systems powered soley by the white wire and without batteries. I tried half wave rectification of the positive as well as the negative half cycles from the generator but ultimately settled on a full wave bridge. One thing I discovered was the usable output voltage ranges from about 25VDC down to about 8VDC depending upon the electrical load. The generator can source 3-4 watts which is adequate for a decent LED light system. The key is to efficiently convert the relatively high output voltage down to the 3 volt range for a high brightness white LED. As others on this forum have noted, the best way is to use a stepdown or buck DC-DC converter. This is what I did for driving the head light. I also included a tail light and side lights to make my bike more visible. I connected 4 red LEDs for the taillight, 2 red and 2 white LEDs for the side lights all in series and power them directly from the output of the generator. The attached photos show the results. The beam pattern on the garage door is from about 20 feeet down my driveway.