Darkness is important for torts and lack of a day night routine could be one of the factors why yours is hiding so much and/or maybe the temps aren't right. The dial type thermometer you are using is one that pet shops sell but they are often inaccurate and yours is placed too high. You could do with a digital thermometer/hygrometer positioned to measure temps and humidity at tort level. A digital temp gun is also very useful for spot checking temps in different areas. The caresheet will tell you what the temps should be.We have just been looking at CHE's and obviously we would want to run it off a thermostat but we already have the heatlamp running off a thermostat. I was wondering if just buying a CHE "bulb" and swapping them out at bedtime would be feasible? Or do we need to 2 separate setups for the 2 heat sources?
The current heatlamp and thermostat seem to do a good job of maintaining a good temperature gradient in the enclosure but I am conscious what I have been told above about having a light on him 24/7. Albeit a dim one.
What are you using for UVB?
I assume the heat lamp is a basking lamp - is it spot of flood type?
Most of use T5 HO tubes for uvb, then a flood basking bulb (spots are too intense) and a che/thermostat for night and extra heat.
For your own convenience and safety separate ceramic fixtures for the lamps would be better but no reason why you can't use the same thermostat and just swap the plugs over.