I had my two week old quail in a plastic tub for a week with a 60 watt light bulb. Then I moved them to my outdoor storage building in a small cage with the same bulb. It go so hot during the day in that building that I went ahead and moved them to an outdoor pen with that same light bulb. They were doing so well and it was so warm that I 'almost' did not use the light bulb last night. Well, today it got cool and the temp tonight will be about 49 degrees. But they seem fine with that little 60 watt bulb. They get close to it if they get cold. Usually I wait til about 3 1/2 weeks before letting them go outside, but they are doing very well and growing like crazy. It really is amazing how fast coturnix grow and how healthy they can be if you keep them clean and well fed. They adjust to changes in temps well. If only I can figure out a way to keep the males from crowing then I will have the perfect quail! In only a couple of weeks they will start their chattering. I really like to wait til they are 8 weeks or older before butchering, but some of them may not make it that long. Without bringing them inside, I don't know how to limit their exposure to long light hours so their crowing will not begin. It is too hot to put them in a covered pen. I guess the only way to resolve the problem will be to hatch in the winter so I can keep them in a dark place for their allotted time.