I depends on how happy she is with her tank & how high her furniture is. They can really jump high, I always used the tank tops when they were little. You can still get a fixture to put the reptisun inside the tank, then she'll get 100% of the UVB. And having the basking light through the top won't make a bit difference. If you have it clamped it might be less hot in the tank. I always found 75W was too hot, I always used 60W, but that's up to you. It also depends on how hot it is in the house to begin with. It's very cool weather up here, so don't have to worry about it too much. Talk to Cheryl & Jess about what they do, too, they're a great resource.
Deb
Deb