I am using the 10.5 inch brooder lamp, ceramic socket and rated to 300 W. Those should be sufficient I think. I'm a little hesitant to go up to the superhigh wattages. If my critters will get enough UVB then I won't worry so much about the lamps blocking out some of it if they are positioned lower than The UV tube. But I think I will have to put the two heat lamps on that and to make the entire and warm enough. I don't know if I'm going to get this all done by the time I go out of town this week if not I'll finish it up next week. They will make do for now, today they're outside in the gorgeous sunshine.The important thing to keep in mind with the higher watt CHE's or bulbs for that matter is that your fixtures are ceramic and rated that high of wattage. I tend to go way higher than I'd ever possibly need, just for the sake of safety.