I have been using a darkness system for 5 years now, I do it to suit my work routine, so I darken after the evening feed on my return from work at 4.30pm, and take off darkness before I leave for work on the morning 8am, and I have had more than my fair share of success with my young bird team, this year alone I was top prize winner and won the young bird average in my club. So I must be doing something right
Good luck m8 be in control of your birds, don,t let them control you