I have a setup that I built with parts from StevesLEDs.com. The site's info and kits are more reef-oriented, but he sells all the appropriate LED's and drivers for building your own FW lighting. Prices are very good, and he has very easy to follow instructions for building and wiring your fixture.
A friend of mine bought one of his drop-in retrofit kits for his Biocube from there and had a good experience with it, so I decided to buy components from there and build my own FW setup. I have 8 6300K and 6 5000K Luxeon's mounted on a single tube with a dual driver board, and am currently putting together a controller for it to do all the dimming and on/off for me.