Technically they do not need UVB/UVA, although I've seen heated debate over that one and I haven't kept them long enough to have my own experience.

But..if they have none its even more so important to feed the correct diet or they can develop that bone disease from lack of D3/calcium. If fed insects, they should be well gutloaded with good insect food and dusted with calcium/d3.

The complete diets have all that, but be aware that not all the foods are complete. Some are "mix ins". It has to say complete food. I think Repashy is a good one and Pangea also makes good ones. Zoo Med has started to make a new one that is decent, but the one commonly sold in petstores is horrible, nothing in it that a crestie would eat. Exp. the one that resembles tiny kibbles. Or jellies. It should be powder that gets mixed with water.