the room the tank is in is rather warm--at least 75F during the day and no less than 70F at night.
I made a wood and wire mesh top for the cage that has 2 hinged openings--our tank had a 'plastic'support bar in the center so I used that as a dividing place. The top fits down into where the 'glass' top would have gone. I have a strip light for UVB going across the back of the tank. For basking I use a 100 0r a 150 (current)watt bulb. The fixture rests at an angle on the wire mesh top pointing to the rock wall. I sometimes use a 40 watt bulb on the other side of the tank for extra light. The rock wall holds heat but does not get hot enough to burn.
I do not use sand. A tank that size would be a pain to clean--and you can never get it all when you scoop--I'm a little parinoid--also my dragon LOVES to taste everything--I know he would take in too much sand. I really like the shelf liner (Duck Brand) it is VERY easy to clean and NOT slippery at all. They had this cool pattern that matched the rock wall...
HTH
DM