My frogs get no sunlight, they are inside in a glass tank. I did put them outside last year to try to breed them (Red eyes are easy, Greens not so. they spawned but infertile) but that was the first time in their lives, the key to them is they love food, once they have a nice fat reserve you can back the food off and just monitor their dody weight, But of course if you go to a pet shop they will tell you you need a UV light!