I've got 11 plants under a 600watt hps and a 175 MH soon to be 250 hps. The girls are in their third week of flower and two or three of them will be taller than to room (aprox 7 1/2 ft with lights all the way up) at this rate of growth i am guessing within a week or two. I meant to top them but missed the window of opportunity long ago. My last grow got pretty tall but I only had around 300 watts for ten so they were always fighting for light and alot slower growing. I havnt got a clue as to what to do about this other than literally making the tops of the plants do a U turn and head towards the ground with string or something. Anyone have any idea on what to do? I am hoping they may slow down as they begin to put more energy into producing buds. There are three strains Big bud (tallest) Mountain mist (i know its intended to be grown outdoors) and a strain labled by sensi seeds as TD ( if anybody knows what that stands for I'd love to know ).