Ok i have a big problem i have a clamp light for each of my set ups im useing a 40 watt reg bulb but i con only leave it on for short periods at a time or they overheat. its not directly over them the buld is about a foot from top of cage and the highest they go is about 8 in from top why are they over heating at 80???? the room they are in stays at the high 70 range...