We find them to be very seasonal layers, Easter to September, roughly speaking. Even young birds haven't continued into winter (as you would expect from a hybrid pullet). Never tried light with any poultry. I suppose you would have to follow same guidelines as you do with chickens in terms of number of hours. Don't you have to be quite careful about timings and number of hours to get good results? ..... Don't know much about the fine points of it.