Audi has been playing with LED low beams for a few years now. Cadillac is getting into it as well. I built a pair of 'ditch lights' for my car, as I drive 100 miles round trip to work everyday, usually in the dark, on country highways. When there are no other cars, I use them to watch for deer (angled toward the ditches). I used the 3 watt maglite replacement LED upgrade kits from jcwhitney and built them into some old driving light pods I had lying around. A 3 watt maglite running at 6 volts (a 4 D-cell model) is pretty damn bright. It lights the ditches at 200' well enough for me to spot deer easily. But as far as I know nobody makes a reasonably priced headlight conversion with LEDs. The prices will come down more eventually though. If you want a schematic (dropping resistor if necessary, etc) let me know, and good luck!