It can help, but it depends on the personalities of the birds involved. It will reduce crowing and sexual activity and violence, but may not eliminate it completely.Does that also work for males? Can you keep a pen of boys together more or less peacefully if they get less than 8 hours of light daily and don’t become sexually mature or activated?
To be honest, it might not keep all hens from laying as well. I had a calico fee that laid an egg every day during the winter when none of the other hens felt like they had enough light to lay.