I sleep during the majority of the day, so my boys only get a few hours of natural sunlight a day before the sun goes down, since they are in my room. I used to keep a full spectrum bulb in my room, but I’ve switched it for a normal one of those twirly shaped power saving ones (whatever they call them) since the other ones kept burning out much faster then they should. The electricity in this house is horrible, and nothing lasts as long as it should.
My boys are strange, I have seen them sun bathe a few times usually during the winter months even though the room is the same temp in winter as it is in summer