DDMTuning is now selling a variety of LEDS, They put out 2000 lumens (standard 55w H4 is around the 1000-1500 range), Not like the 5000 their HID produce but still pretty bright.
http://www.ddmtuning.com/Product-Categories/LED-Bulbs-Lights/Car-Truck-SUV
I'm thinking they would make a good assy...