I don't know how much natural light you have in your coop, probably from windows. You need enough light for you and your chickens to be able to see what they are doing in there during the day but when it should be dark it should be fairly dark. If you don't have enough natural in there for them to see how to go to bed, they may have going to bed issues. If you have light outside from street lamps or such, it may get too dark inside the coop for them to see before it gets dark enough outside to tell them to go to bed. People have solved these problems when they have them by putting a light inside the coop for a short while when it is getting dark. If they do not have access to the run yet then this is not an issue.