will metal halides make my plants stretch

i am flowering with 2 x 600w hps, my plants are healthy short and stocky, i was thinking of adding my 2 x 400w metal halides to help the growth speed along but will they make my plants lanky skinny and stretchy?

thanks.

Metal halide lamps are what most people use to VEG with because they have more blue spectrum which keeps plants greener and helps to keep node spacing tighter. Alot of growing mags will tell you to use MH for your 2week stretch.




J