There is no need for any extra lighting. BPs are nocturnal.

From the caresheet:

"LIGHTING
Neither UV lighting or supplemental lighting is required for ball-pythons. They do well with ambient room light, so long as the light is not constant and some sort of day/night schedule is provided. Excessive lighting can induce high stress levels in these nocturnal creatures."

http://www.ball-pythons.net/modules....warticle&id=59