Where our coop is in our yard it does not get much sun in the fall / winter. Are there any artificial lights that simulate sunshine? I know vitamin D is important for them. I don't want it for better egg production, they do just fine but I know they need some sunlight. The front of the coop faces west and in the summer the sun beats in their protected run. I made an awning so they have shade and it made a huge difference. But winter is coming and I've taken the awning down but they don't get enough sunshine. I would guess about 20 minutes in one small corner in the afternoon. I thought about putting another window in the south facing wall but have not suggested that to my dear husband yet. Does anyone have any ideas? Thanks in advance! Here's a picture of my setup. Here are the summer curtains and awning.