Just a note on what is natural. In the fall, in a natural setting the food the animal/bird eats starts on the cycle of being more scarce and an animal or chicken can conserve energy by spending more time at rest. Because less food is available and long, cold nights are hard on the weakest of the flock, this will be the greatest time of mortality of the old, defective and sick.
In a coop where high quality food is constantly present there is no need to conserve energy beyond that which is required for a rest period - that usually considered to be the period of dark in mid summer.
In fact, there could be an argument that the additional feed and energy of extended hours in the winter helps protect from the chill when energy ebbs in the early morning hours after a long night. I am not saying this is true, just a possibility.