Just raise the 10.0 about 3 to 4 inches above the screen. No need to go buy a 5.0 if the 10.0 is still in perfect shape. Unless you have other reptiles that can benefit from 10.0, I would just raise the bulb a few inches away. 1 inch changes the intensity of the uvb a lot at around the 7 8 9 10 inch range