It's a 6500K compact flourescent from Wal Mart. It's a Lights of America one. My WM had 2 different models with different wattages, I got the higher wattage model, although I can't remember now what the wattage is.
I've got to figure out a better way to mount it above my refuge. On my old one I was able to just clamp it to the side of the tank, that won't work on the new refuge.