here is two different examples of how to setup basking spots and what the beardies should look like when they are under them enjoying the heat and UVB
Sandy's spot 100w zoo med halogen basking bulb (controlled by a dimmer) and the florescent is a 1x reptisun 10.0 and 1x daylight florescent bulb (dual 48" shop lamp with reflector)
her basking spot is about 100-105F depending on room temperature (70-75F) at the basking spot shes about 8-10" from the
UVB bulb on here rock there where she sits, the fixture has a very shiny reflector however so it increases the UVB output by a pretty large amount
Lizzy's spot is a Powersun 100w MVB and a 75w GE reveal halogen spot lamp also controlled by a plug in light dimmer to control the basking temp
her basking temps run a bit higher than Sandy's about 105-110F but that is because she prefers more heat, her previous owner gave her way too much heat so shes kind of used to it i guess