One is custom sealife 10k replaced with Sunpaq 50/50 (10k/460nm actinic) and the other is coralife actinic 03 (420nm) for another of the same, both 96w. These pc's don't last as long as they are touted to last, thats for sure. I don't have MH for this tank, just some direct sunlight for a couple hours, so basically the pc's are the main light for the tank. The corals seem to be liking the change to new lights.