I used to put lights on to keep them laying, but I found out I was burning out the hens too fast. They would only lay for so long, and then quit, or die. I have since learned that by giving them a rest they will continue to lay for many years. Lay bigger eggs, and they will have better egg shells. Their body seems to need the time off to rebuild and regenerate. If you're in it only for rapid egg production, and plan to replace the hens every year or so, then the lights are fine.
