I have a day night cycle on mine, but the night cycle is my night cycle too lol But the lights provide no heat.

The heat comes from the under tank heaters and radiant heat panels.

Good on you for researching and asking about ball pythons before actually committing to one. You chose an awesome forum.

OH! If I could go back and start all over again, I would definitely use a PVC enclosure instead of tanks. Heat and humidity are stabilized almost effortlessly with pvc enclosures.
I takes more time and money (if you want it pretty) to do the same in glass tanks like the exo terra ones.