Depends on when to start the 12/12 cycle depending on your strain. I notice that your a newb to "growning" because we have no problems lol . If you could post some pictures of your "shade" leaves then please do. Please tell me what light you're growing under or if you're doing this outside. If you're growing it inside, put a fan in the same room with your plant with the shade leafs, the leafs wont get as big.