I pmed you back, I hope it was not to late. I use the jebo lighting, and I think they are fine. The lights themselves do not put out a lot of heat, but he ballast in the fixtures get smoking hot. My goal is to one day fix mine so the ballast are remotely located "meaning not in the fixture" The fixtures do put off heat as a unit, but I do not feel like it is enough to concern yourself with as long as you do not set the fixtures right on top of the tank. I have mine suspended from the ceiling, about 10 inches from the top of the tank