Truly, I'm not trying to be argumentative, but I am curious where you have seen this debate about UV light and ball pythons.

Here is a quote from two of the leading scientists in the world of herps:

"Ball pythons have no known light requirements. We have seen what appears to be perfectly healthy ball pythons that have lived for years in dark closets. Cage lighting is primarily for the keeper's enjoyment of his or her charges. In some cases, lighting also can be a satisfactory way to control the temperature in a cage."
Pythons of the World, Vol II: Ball Pythons

About the authors:
David and Tracy Barker are graduate biologists with more than 65 years of combined experience with reptiles and amphibians. They both have expansive herpetological backgrounds, including work in zoo herpetological collections, museum collections, and field research. Herpetoculture is the main interest of this husband and wife team, and their combined interests and experiences range from dart poison frogs to ridgenose rattlesnakes. David and Tracy own and manage Vida Preciosa International, Inc., one of the largest and most successful collections of pythons in the world.

Seriously, no one is trying to be critical or mean. We're just trying to help make things easier for you so in the long run, your snake-keeping experience is as rewarding as it possibly can be. But please understand that no one (that I know of...and I know a lot!) that keeps ball pythons is going to be able to come up with a satisfactory solution that includes UV lighting, simply because no one else considers that a needful factor in their husbandry care. It's kind of like asking folks how to make more room in the trunk of your car because you keep gallons and gallons of spare fuel, motor oil and antifreeze back there in the trunk...just in case you might need it on the road someday. No one is going to have a satisfactory answer to that because no one else is going to such extremes.

But, of course, in the long run, all these are your decisions to make, and I wish you the best of it, whatever you decide to do.