Hello, I am new to owning a bearded dragon. I’ve had him for a little over a month now. He eats great (roaches), poops about 2x a day. We got him a 40gallon Tank. The ones that has everything u might need. I now know that those light are not the best so I got him a Arcadia D3 12% UVB T5 Bulb - 22". But every time I turn it on he turns dark with stress marks on his belly/beard and will sometimes hide. When I turn it off and turn his coil UVB (the one the tank came with) he goes back to normal. Did I get the wrong one?