I found this link for someone in another thread regarding lighting.
http://smallfarm.about.com/od/chickens/a/Light-In-The-Chicken-Coop.htm
God bless,
Daniel.
Pine, a lot of things could play into why the birds have stopped laying. Some peoples birds are molting, and as a result that stops or slows egg laying down. A lot of people have been having battles with lice and mites this year, among other things, and those will slow down/halt egg production...