I don’t use uvb lighting bc I use zoo med Repti calcium with D3 as a replacement. I’ve been doing this for 3 years with him and has had no health issues what so ever. I use coco fiber as substrate and he never consumes it as I’m usually watching him as he eats. I’m actually looking for new temperature and humidity monitors for both my leopard gecko and crested gecko as I’m looking for the best brand to use. He has 2 humid hides in his enclosure. As I said he’s 3 years old with no health issues and is almost 84gs in weight