No, uvb bulbs shouldn't even really emit heat. However plastic filters out the uvb rays so if your bulb has to make it through plastic to reach your beardie, well your beardies not getting much uvb.
I just set Swordtail's timer for his bath and paused it so I could actually fill his soaking bowl up and he crawled over my phone and canceled the timer
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!