You need a T5 HO UVB LINEAR TUBE FLORESCENT
Either a 10.0 or a 12%, depending on the manufacturer. Place it 10 to 14 inches away (without a meter, this is a guess)and use it for a few hours per day.
I've also used a 5.0 or 6% that I used as the sole light source. Your decision. But with the stronger uvb, used less, you'll also need another low light source to provide the 12 hours of daytime. Such as another florescent light.
I don't use heat lamps or flood lamps for a Redfoot. They are too bright and often take humidity out if the enclosure and are desicating to the shells.
I use a CHE for warmth. Night and day. Since they provide no light.
Redfoot are one of just a few species that can be provided a 5.0 or 6% uvb light. They do well with a little less.
So, to clarify:
10.0 for a few hours a day. With an additional light to total 12 hours. Plus a CHE for warmth.
5.0 as the sole light source for 12 hours a day. With a CHE for warmth.
You need warmth of between 80 to 88 degrees. 82-84 is perfect.
And humidity of over 70% 24/7