My chickens will be 20 weeks old at the end of September. Is supplementing their daylight so that they start getting 15 hours of light per day in the middle August too soon? Would that be forcing them to grow too quickly? Should I wait until they are closer 20 weeks old to implement my lighting plan? Or would the sudden change of light going on at 4:00 (+/-) in the morning be a shock to them? Any advice would be very much appreciated.