if your light is at 10 inches above plants they will not stretch much if at all, i usually have 1000 wt hortilux 5ft10 to 6 ft off the ground, on veg cycle you can really see the difference it makes, lite closer ,the structure of the plant will be compact, then raise your lite a foot and watch where the next node comes in, ive posted a few pics in adv. tech. forum, dont burn them till its in a paper