Some reptiles absorb vitamin D3 to produce calcium through UV lighting. Ball Pythons are not this type of animal and have no light requirements. It is best to not provide light at night routinely to reduce stress and to allow them to acess to a hidebox. The hidebox should typically fit them tightly and allow them to feel pressure from it while under it to give them a sense of security.
For heat, you should be using a UTH- (Under tank heater) and should have a thermostat for it, or a dimmer switch used in conjunction with a thermometer with an external temperature probe or another method of measuring the temperature at the point of potential contact with the snake. (I attached a link to a thermometer that would be ideal- even has a humidity gauge!) (also a caresheet link.)
Edit: Keep in mind that Ball Pythons are African and NOCTURNAL- they have rare exposure to UV light in the wild. If you actually read the two studies that Chris B posted after my post, neither indicates that Ultraviolet light would be of benefit. I have never seen a report of a Python Regis having any anemia for the nutrients he has listed, as they digest those nutrients from their prey food. The second study anecdotally discusses that they may see UV light trails left by prey animals that would not be visable to the human eye.
Aside from necropsies of animals that died of starvation, the only claim that I ever heard of a Ball Python with metabolic bone disease (MBD) was a misdiagnosis of a female that went off feed and was still bred every year. The shelling of the eggs robbed her body of calcium. This caused some breeders to supplement calcium to breedstock females.
The bulbs would not be harmful to the Ball Python, but if you talk with major Ball Python breeders I doubt if any provide full spectrum lighting. You could give David & Tracy Barker a call- I believe in the 1990's they thought Diamond Pythons may benefit from full spectrum lighting but I have not followed up on their findings. I would suspect that providing vitamin powder on or inside their food would be significantly more beneficial and still not usually necessary.