I have preflowering going on with my autos. I have had the light on 18/6 off. It has been four weeks. Should I change the light cycle since they are autos? Also, I have a SF 1000 LED, is it time to lower the light too? The light is about 30". Thanks! This picture is not my plant but that is the stage mine is at where the little white hairs are just starting to show.