ok i wanna add 1 final note to this thread by asking u a small question..... why do u wanna change ur light cycles like that and what do u hope gain from doing this??? my personal view would be that if u go with the 18/6, then 20/4 and finally 24/0 , that at the end of it any changes u notice will be very few indeed if any. flowers are produced during the dark period as the plant releases a hormone to promote flowering. i am not a lover of a 24/0 light cycle as i think it stresses a plant more than anything else. by keeping the to what other LR growers do u will get the most from ur plants . also with the 24/0 light cycle at the end of flowering are u going to have produced enuff extra bud to cover ur costs for electric baring in mind that LR is a very small producer with reports of amounts as low as a quarter per plant.