I have four hens and a hen house that has about 33” space on inside from bottom to top of roof. wondering if it would be okay to use a reptile heat lamp, 150W instead of standard 250W, attached securely to top for days that are in single digits. Seems like standard heat lamp would be way too hot for this small space. Or, would reptile heat lamp be too hot? I have straw packed around bottom and am using deep layer method so perhaps they are fine with no heat even below zero? Thanks.