As Icemaiden says, it is best to let the hens naturally stop laying for a while, rather than force them to lay. Their health will benefit from the break.
We did try artificial lighting in the coop to extend the daylight hours. Of course this means putting food and water in there, so it needs a big coop to start with. They went to roost naturally as it became dark, otherwise they would be scrambling about on the floor and risk injury if lights went off suddenly in the evening. The lights came on at 4.00am and they then ate and drank for an extra 4 hours or so. But in such a small area they rapidly became bored and scratched up all the bedding, mixing it with poo, food and their water. The resulting mess required a complete clean out every day and simply wasn't worth the cost in wasted feed, new bedding and all the time spent for a few extra eggs.