Alright, so I just purchased a 125 w exo terra Mercury bulb for a 20 gallon tank with both uvA and uvB. I was using 2 separate bulbs for uvA and B, but the heat bulb was not heating the tank enough so I went from 100w to 125w. The combo bulb seemed like a good idea and had positive reviews on Amazon. Now I am worried my dragon won't get enough uvB from this new bulb. Should I use the separate uvB light as well, or is it possible for my dragon to get too much uvB?
Mercury vapor bulbs are very strong and should actually only be used on a 40 gallon breeder or larger tank. What is the basking & cool side tank & what type of thermometer are you using?
Why do you think your beardie won't get enough UVB, is he not laying under the bulb while basking?