Hi, I know that I am not on here a lot, but I would not call keeping your birds in the dark at night for 12 hours cruel. I have had birds since 1976, light is like food or water, enough is fine. To keep my parrots from breeding, 12 hours of dark works for me. I know that a chicken is not a parrot. My parrot talks, my chickens could not. Dylan the parrot says, "Let's go" at bed time. She likes it in her dark night time cage in my closet. I know that your meat birds are not the same as my parrot, but I do this for her to keep her from laying too many eggs. I hope this input gives you some understanding of birds. They are not like us in a lot of ways.