Of course now that my coop is getting close to done, forecast is looking cooler. Should 6 week old chicks (6 of them in a 4x5 ft coop) need a heat lamp down to 50 degrees at night? All I have now is a 250 watt red light--should I get a lesser wattage to give a little heat in the coop, or could I attach a heating pad to the wall for a few days to transition? TIA!!