I've built and I am using some of these LED's in my reef tank setup. Most notably, I have a rigged a 50W broadband (chlorophyll absorption friendly) LED over the refugium of my 55 gal tank. It's been running about 12 hours every night for the last 6 months:
This LED uses 115 VAC. The refugium grows chaetomorpha to reduce nitrates and phosphates in the tank.
I also have a three-50W LED prototype that runs on 36VDC over another tank (2 cool white's with a broadband in the middle). I'll post images of that soon.