They don't need light, they would prefer it darker as they naturally would be in a dark burrow during the day. You want to get the warm spot in the high 80's to low 90's. Most prefer small tight hides which they can squeeze into to feel secure. When he approaches shed you need to bump up the humidity by misting down the enclosure so he sheds correctly. Try to keep the rest of the enclosure in the upper 70's to low 80's.