We got our little bearded dragon about a week ago and I'm still trying to figure out the lighting. Right now I have a 100w basking bulb, a 26w coil UVB and an 18" tube UVB on a tank that is 40 gallon. I ordered the Reptisun 10.0 T8 bulb for the 18" fixture but it arrived broken so I'm using the bulb that came with the fixture which is just a standard F15T8 fluorescent bulb. I'm working towards getting a 24" fixture and with the right UVB tube bulb I could hopefully eliminate the coil bulb, but for now this is what I have. Any advice would be appreciated!! Thank you!