How long did they complain loudly? Chickens often don't like change but they are also typically pretty adaptable. I anticipate if you are consistent they will quickly get over it.One night I had the lights off but there are windows in there and the sun set around 6. I usually turn the lights off at 8 or 9. They were not happy with the earlier bedtime and got really loud. They also don’t like abrupt darkness and complain loudly.