That's going to make a really great home for Boris! You'll want to turn the UVB off when you turn the basking light off in the evening. I keep them both on the same timer. If the enclosure stays above 65f/18c in the evening, no additional heat is needed at night. If the temperatures dip below that (possibly just seasonally which is the case at my house in the winter) you can get a ceramic heat emitter to boost the temperatures a little bit overnight - just put that on a separate timer. You'll want to keep a bit of a cooldown period overnight though so don't boost the temperatures too high.