I have a cage very similar to yours, and my tortoise always tried to escape that cage. One day he managed to push the cage door open, and we searched for what seemed like hours, and finally found him. But you might not be able to find your little tort again.
We did get a lock on it so he can't...
Also, there is another light on in the room that he is in that we can't turn off. He still has lots of darkness in his enclosure and a hide that he never uses though. Could this be an issue too?
I will look into another light.
I think I am using a 10.0 uvb light if that answers your question.
Yes I am using a CHE for basking, I can see if we could change that if its a problem. Just curious, how would the bulb affect his behavior? He sits under one a lot, will it hurt him?
Thank you very much for your advice.