We are still fairly new atn this. we built a nice coop, and it has a window and vent. I was worried that it did not have enough light, since we live in cold weather winter climate and wanted to make sure they were warm. since they are laying nowm and have been and started about a month ago, and we are not nor have we used any artifical light at all and they nare laying good, can I take it that the light situation is ok?