my advice, do not use white light. I have the 250W red heat lamp for subzero nites, and got a 150w red flood light as well for nights in the teens. my first girls were raised under white, and all have some baldness near their vents. I think, at first they plucked em out of each other, and now two of them are constantly grooming, pulling out their own new feather-growth. I've tried all the tricks, de, bag balm, blu coat. there are no mites, and i'm convinced that the behavior is a result of raising them under white light. All my 6 mo. old's have fluffy downy bottoms.