:lol: It's virtually impossible for a bearded dragon to get too much UVB!
That being said, it sounds like you have the Reptisun compact coil UVB inside your dual lamp fixture, which actually presents a different problem. Coil-type UVBs are very intense, and some bearded dragon keepers have reported that it bothers their bearded dragons' eyes and may cause vision damage.
How old is your Reptisun T5 bulb?