Uhm I didnt know I was suppose to have one or the other. I have a 100w Blue multi spectrum light pretty much over his hide and there is a UTH (ha) Under his hide. I just added the light recently because his tank seemed to be to cold on the heated side (around 81) and he wouldnt come out from under the hide at all. I need to learn more on managing humidity because before coming to this forum I didnt realise it was so vital. He is in the middle of a shed to and Id really like to make him as comfortable as possible. Suggestions? I have a 40g regular set up with a Hide and a water dish and cypress mulch. I have had this same set up from the get and it seems to work fine but I know know if its just me being misinformed.