Ball Pythons are nocturnal animals, so it will stress them out to have a light on 24/7. In fact, as far as biologists know at this point, they do not have a physical need for light at all, unlike lizards, who use sunlight to synthesize some vitamins. It is ok to drop temperatures a few degrees at night, but don't turn off all heat sources. I leave my heat sources on 24/7. I would suggest a ceramic heat emitter for heat. This puts out heat, and no light, and fits in a spotlight fixture. You would then need some supplemental lighting for nighttime viewing.