I know, I just don't usually feel comfortable leaving the heat lamp on, when I leave the house, out of fear it starting a fire (unlikely i know). But I don't feel comfortable leaving it off either. It's not his only heat source, he's got a UTH, so its not like the lamps live or die for him. but the lamp is to add about 3 degree's to both sides. So I'd maybe keep it on for 2 hours, off another 2 hours. I hear that this kills the life on the light though if its constantly heated up and cooled down.