UTH can sometimes have difficulty heating tall enclosures like a 55g tank so this is probably why red light is being suggested.
I'm fond of Animal Plastics but there are a lot of good choices out there. If you change to something like that, which is a lot more ideal than a tank, you are going to have to change to a radiant heat panel (also more ideal) instead of the red light, because they don't have screens on top like a tank does. There are models that have screen on top, but that's really a poor choice for a ball python anyways.