Since we've had him, we've been using a ReptiGlo 5.0 UVA/UVB CFL bulb. It stays on for about 12 hours. It's 6-8" away from his basking spot.
The parts of his skin that he exposes when basking have become slowly darker. On his legs, the most exposed parts don't even show visible lines anymore. It's just pretty much solid brown.
Is that a normal thing, or is his lamp possibly too close? Or should we be using the UVA/UVB bulb for just a few hours a day?
I don't want to give my turtle skin cancer.

