Ok so you will lift the fixture 4 measured inches off the screen top. Then you want to add in a flukers vine or branch so that it sits 5 inches below the screen below the UVB light. Not only will this help him get down but it will be the right distance for a uvi of 3 at the vine/branch and then on the screen he will not be in over exposure levels with it lifted 4 inches.I don’t have a solar meter but it’s a reptisun T5HO 5.0 in the Repti sun hood