So I built a big coop and run for my 8 ladies. My problem is that the coop gets pitch black before it gets dark outside and they will not go in to bed unless I turn the light on and then they all run right up. Is it ok leaving a low wattage light on all night or should I put it on a timer of Some sort. Also is it ok to just shut the light off like that cus I know they can't see in the dark