I keep red-eyes, have for years. They don't need UVB. That being said, I have seen hypocalcemia in this species. I don't think it was a result of a lack of exposure to UVB.
Hypocalcemia may happen when you feed to early in the day. When feeding extremely nocturnal frogs, its a good idea feed just before lights out. Feeding earlier in the day will give the crickets a chance to clean the calcium/vitamin D supplement off.