I'm using a Repti-glo 5.0 14w
Those have been known to cause problems with beardies I would do a search around this site for Reptiglo compaired to Reptisun 10.0. The reptisun have been known to boost appetite, activity, and improve temperament.
In the mean time can you answer a few questions to help us further help you?
How big is your cage?
What watt basking bulb do you use?
Do you have any standing or running water in the tank?
What are you measuring temps with (stick-on, digital w/ probe, temp gun)?
Where are you measuring temps?
What are you measuring humidity with?
Do you have any substrate in your tank?
How old is you beardie?
-Steve