You will get more eggs in the winter from your chickens if you put them under lights. However, chickens only have a certain number of ova, and when they are used up you stop getting eggs. Confined commercial chickens are kept under lights up to 24 hours a day to maximize their laying, and live very short lives because of it. If you keep your chickens under lights throughout the year you will shorten their effective laying life, meaning that they will lay as many eggs but in a shorter length of time. If you have chickens as a commercial enterprise, then lights are a very effective way of maximizing your investment. If you keep chickens for eggs and enjoyment, and don't need to maximize production in the least amount of time, then your chickens will last longer in your laying flock if you leave them under natural light. You will get just as many eggs, just over a longer period of time.
As I said above, people who know more about chickens than I do suggest early light rather than later so that the lights don't suddenly go off when it is dark out, leaving the chickens to find their roosts in the dark.