Well, honestly I don't know many people who use bulbs on their bps. I have them on my beardie though. His day bulb is on for day hours, and his night bulb is on for night hours. If I don't turn his lights off, and it's dark outside he starts running around his viv making all kinds of noise. Then when it's dark, he just passes out. It's hilarious.

Bulbs really aren't needed for bps though, just FYI. They do fine with belly heat. Of course, if your house has really low temps I can see why you need them. As long as you are keeping the humidity up. They need humidity.

I would follow the day/night cycle outside I guess.