Light: much Power less hours

Hi! Yes you can do both! How powerful led are you going to add? I've heard that adding too much lights in middle of flowering can turn the plants to reveg. I doubled mine but still went good so... Also I've read that plants mature little bit faster when the lights on time is lowered gradually and what i do is that during flowering every two weeks I take 30mins off from lights so 12/12, 11.5/12.2, 11/13, 10.5/13.5, 10/14 and 10/14 is the final I finish the girls! Don't know if it helped but I'm satisfied with the end result either way!