Wel it woud be a waste of grow room if they only got 3 foot high at flowering,i have 6 more feet from them to grow,so i'd like to make them taller so that my plants would produce more bud!I have topped them 2 times i have plenty of runners so i;, hoping by moving the light up i can get them to stretch some then i'll lower it back down to 10 in from plant!