Hey guys new to this but need a hand! So I have a thermo setup temps great over his basking spot wich is also his nightly hide underneath. Now it's getting a little cold at night so I've turner the temp of the heat lamp and the thermo right down to like 17 just so it stays dim... But I have a heat mat on but not thermo do these little guys need pure darkness or should I just leave the heat lamp on and don't worry if it's not dark? So confused.