my 20 cornishx are now almost 6 weeks and are feathered for the most part , but some seem to be alittle bare under the wings and on the breast. I removed the light last week, and since then we have had a real cold and wet snap. tonights temp is around freezing and it's 48 in the coop. The birds have all been sleeping togethor side by side. Should I put the light back out there or are they fine without?