A couple of months ago, we were down to about an egg a day from our chicken flock. To be fair to them, some weren't yet laying, but still...that was a lot of feed for no payoff.
I started an experiment with lighting the coop, but because of the chicken illness brought home by a stray hen, I stopped doing it for a while. After health was restored, I decided to restart the light regimen.
Overall, I'd say that adding the winter lighting has been a huge success. I have two lamps (brooder clamp lamp style), one in the coop and one shining into the run. They are set on a timer from 4pm to 8pm, so that the chickens are long asleep before neighbors might complain, plus they are generally very quiet then. It is only in the morning when they are laying that they get a little noisy...except for a couple of days ago when a mockingbird was hanging out in the tree making fun of their clucking. That got them really upset, but it was pretty funny to me.