We'll be brooding our chicks outside in their coop. The coop will be divided off, but not to the ceiling. So some heat may escape into the non-populated part of the coop. It is about 4 x 6 and about 4' tall inside. I want to get a red bulb so should I get a 250w? Or would a smaller wattage be enough? The other concern is that the heatlamp itself says to limit to 150w or something similar (definitely way less than 250). Is there another type of lamp? I looked at TSC but they were out of the regular chicken heatlamps with the metal cage on them and the smallest watt red lamp was 250 so I didn't buy either one. I may have to order one online if we can't find one locally (we're going to check another store tomorrow). We are getting our chicks next Friday so I need to get to ordering if that's what I have to do.