I just dont feel like the Powersun gives enough UVB. Especially after a fellow memeber posted some of the output ratings for some other bulbs and then compared them to the amount from natural sunlight or the shade. My setup is about 5x3.5x3.5. Im thinking a 36 inch maybe as big as I can find,and ought to cover most of the cage; as I saw recommendations for at least 75%. The biggest problem Im having now is deciding which one to get. Which ballast would be best, reptisun 10 or 5.0, or other? Ive read about this Arcadia bulb, if im remembering it correctly, but Im actually in the process of moving around and just needed to grab a quick setup from petsmart until I get back and have time to order a better bulb.