I have a bunch of new chicks I want to raise outside in my current coop. It's 3 sided and big with straw. I'm in Tennessee and average temperature is 30 to 40. I have full size hens out there but have built a safe 4x4 box with wire for chicks. If I put a lamp on constantly will chicks stay warm enough? I can hang lamp as low as 6 inches above their straw. Thanks for help. Oh and using 125 watt red bulb.