^^^ What he said about the Accurite!.
The optimal temps for BP's is to have the ambient temperature at or around 80F. They will need a warm spot at ~90F with a humidity of ~60%. You shouldn't have a problem keeping the ambient around 80F with you heat lamp as long as the room is around 73-75F. I recommend you get a thermostat to regulate the UTH. It will prevent the UTH from getting too hot and potentially burning your snake!
Thermostat:
http://spyderrobotics.com/home/products.html
It is a bit pricey but it is highly worth it when it comes to your snakes health.