It looks like you're using a UV bulb on the right side. Could be wrong but those are unnecessary. Ambient light from daytime through windows is fine. If you insist on using a CHE i'd suggest getting the proper housing for it. That dome is prone to overheating. CHE's come recommended with wire domes. Otherwise switch to two infrared heat emitters on both sides, with an ink bird thermostat (they're cheap, 40 bucks on amazon and work great) and set the thermostat to regulate the ambient temp at about 78-79 degrees. You can run both heat domes on one thermostat. I notice you have a lot of branches high up, get rid of those. BP's don't really need to climb, and they are susceptible for breaking bones from a fall that high due to them being fragile. Also tall is alright, would make it harder for them to escape, the closer they get to the top the more strength they have to break free. For more even heat with that tall of an enclosure i'd try combining both IHE and UTH with some insulated heat tape around the sides of the enclosure, About a foot up from the bottom, and on the outside. While keeping that room at around 70-71 degrees F The heat beam from the top shouldn't be a problem unless you give the snake access to right under it. IHE bulbs come with a chart to measure the temp of the heat beam from top to bottom. That's my suggestion anyways.