There are a couple problems with LED's for headlights.
1. They're not bright enough. Sylvania quotes 910 lumens low beam and 1500 high beam for my car's 9003 headlight bulbs. The best LEDs at SuperbrightLeds (i think your source) are only 480 lumens.
2. The light source is wrong for the headlight reflector. It's designed for a point light source, and the multi-LED "bulb" is bigger and more spread out. That means the light will not aim down the road as it should. Instead it will spread too wide and too high and blind oncoming traffic, while not putting enough where you need it.
Combine those two and it's not a good idea.
My solution:
http://ecomodder.com/forum/showthrea...red-25490.html