I started using only my radiant heat panel in my PVC cage no UTH . His hide is about 88 and out in front of it it's 90. My thermostat is set to 85 probe reads 85. My temps across the cage from far corner are 76 and get up to 90 on the other side. In my glass cage I ran a uth and made. The hot spot 88, the other end was a ceramic heat bulb and it was like 78 at the thermostat probe. The snake didn't seem to care for temps 90 or more. He wouldn't stay in the hide during the day. At lower temps, he did. Same as my PVC cage. My BP is young still. I don't feel he needs heat up at a solid 90.