I quoted this from
Bearded dragon care sheet
"To give off enough heat for proper digestion basking spots should be made. One basking spot will be fine; however, two basking spots are better (IMO). These basking spots should be 105-110F for babies and juvies, however, once the adult stage is reached the temps should go down to 95-105F. A regular house hold light will be fine, its better then buying one from the pet store, so I would recommend this. The cool side of the cage should be 80-88F during the day. Night temperatures should not go lower then 65F, if the temps go any lower, you should use a CHE (ceramic heat emitter) to get the temps higher. I would not suggest using a UTH (under tank heater), bearded dragons do not feel heat from under their bodies, so they can actually get burned from the heater. Also never use any heat rock, as mentioned above, they sense heat with a “third eye” located on top of their heads. Be sure to keep a thermometer on each the cool side, and hot side for both temperatures.
Use a temp gun, or a digital thermometer for accurate temp usage. Stickthermometers aren’t accurate at all, so be sure to get one of those. Adigital thermo can be purchased at Walmart or another comparable store.A temp gun can be purchased online or maybe at a pet store."