Hi ppl, im in2 my grow, now, just spotted my 1st pistillate preflowers, 2 on 1 girlie(haha, im buzzin, my 1st girlie, grown all by myself, nuthin 2 u guys i know but stil, heh heh heh. My plants are northern lights, 4 plants r 6 weeks old and 3 plants r 4 weeks old. The pistillate flowers r bith on the same plant, when do u think i should turn my lights to 12/12, will the 4 week plants be ok if i do it now, or should i wait another week or two? plz, im in a stress about it, dont know whats best, they r under a 400watt hps. all advice appreciated, 1st timer uk.