You have to get the proper size cage and proper wattage on the RHP. Lower cages seem to work well for BP's. Don't worry about belly heat coming from the bottom. The RHP heats up enough of the cage for a BP to get a hot spot. The warm hide will be in the upper 80's. I myself use a tile under the hide that's larger than the hide. I put it on the arm side under the RHP. The tile collects heat and brings it under the hide. The hide will act like shade to the BP but the ambient temps inside will be upper 80's. The tile warms up nice also. Far end ambient temps will be 78, middle cage around 80, warm side will be 90. Inside the hide will be about 88. I prefer the RHP's to UTH's. You have to let a cage run for a while before you know the true temps... if you get something with a RHP.