I've had the opportunity to play with several lighting scenarios. As for LEDs, the Morimoto Powerstroke 2.0/3.0 work the best. Due to the oddball housings of the CF, you will need to file/grind a little on the aluminum housing of the bulb to fit the high beam side. I have have these bulbs in all four housings. However, all that being said, I would go with a quality HID in the low beam, and the LEDs in the high beam. This seems to be the best overall combination. This is our setup in two different CFs in our current possession.