Too much space. Cover the back and sides with an opaque paper or background, get another cave hide for the other side, and add some scrunched up paper or fake greenery for hiding/security.
Also, get rid of those dial thermometers (they are crap) and get yourself a digital one, preferably with a probe. Acurite is great and an in/out/humidity unit with probe is around $12-13 at Lowes or Walmart.
Also, how are you heating? Is there a UTH on a control device or is it just those lamps?
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