My vet told me a while ago that I need to have a UV light for my indoor call duck for vitamin D and hormone regulation. I bought a bulb from the reptile section of the pet store and hooked it up to an 8-hour timer, and I just left it at that. But, today I read that too much exposure to UV rays can cause cancer, which I suppose does make sense. Now I'm very concerned. Does anyone have information on the right amount of UV exposure for an indoor duck, and a female call duck in particular? I know she needs the simulated sun, but I'm so worried!