Only 80 watts right now...2 40w GE daylight Eco-Lux 4' 6500K 3050 lumen tubes. I am going to add another workshop ballast and some cfl's when they get bigger ....I'd like to get an HPS, but I don't think I'd be able to keep the heat down due to the location in the house. The fixture was 7.50 and the tubes were 9.00 btw.