Move the light as far up from the canopy as possible. This will cause the main stem to stretch for that light. 750w is good, if you don't see the stretching you want try going down to 400w.

Good luck!
ThePinkJina Reviewed by ThePinkJina on . four by four by seven grow room basement first crop! "Owls Shawdow" This will be my first grow in 30 years last grow was 1976... Old fart here..1000 wat hps 420cu ft fan for light and filter with cool tube and a.c. CO2 with boost bucket oscillating fan mylar walls growing feminized mix from nl seeds 4 mix and 2 G-13 haze.18-6 plants in vegative 8-10 inches tall now topped and lolly poped. Have T-5 set up under work bench with two 6" 170 cu ft fans intake bottom exhaust top both filtered 18 2' lamps total for clone seeds vegative......can't tell it's there even Rating: 5