We have a light on a timer. Depending on he time of year, we have it set differently. Right now we have it set for 6 - 8 am. Our's tend to go in to roost about 5 pm on their own, so there's plenty of light in the evening now in the coop. In the darker months we had the light on until 7 pm to make sure everyone was settled before it was dark in the coop. Of course, it makes a difference if you don't have windows for natural light in your coop. Our first tractor style was really dark inside, so we tended to have the light on more than we do now.