Hello, I have 7 australorp and buff orp pullets, they are about 20 weeks and I know it would be on the earlier side of laying to start but I am concerned about the cold weather, we are already in the low 30's some mornings here with afternoon temps all the way up into the 70's. and of course the days are cut very short. I don't have a light in the coop. would this help them get started? what else could I do? they are starting to get much bigger and brighter combs so I assume they are getting close. any advice would be appreciated.