you should still be able to use the 60 watt bulb for heat. I have a 2x2x4' tall enclosure and the 60 watt bulb I was using kept the temps great, I hung the light from the ceiling (with a screw in hook) and then I could adjust the heat by raising or lowering the height of the light. I dont even have a separate heat bulb now, I have my 5.0 tube and a hood with 2 26watt 6500k cfls (for my hibiscus and plants) that keep the temps perfect for my female veiled. hope that helps.