I also use the moon glo bulbs. They give off just enough heat to keep my cool side temps up where they need to be. I was using the red bulbs at night but the tank is in my room and the red bulbs made it kind of hard to sleep at night. The red really didnt seem to bother the snake any the moon glo is more of a personal preferance of myself. The moon glo is definitetly give a more natural look.