So a 400w HPS couldn't keep up either? They would be right next to each other so they would share light.... I guess ill have to buy another 600w HPS if im gonna double what im doin... Hey georgia which hydro store do you use? Atlantis?

"The blue light from the MH promotes vegetative growth, it doesn't inhibit it."
I've noticed that MH make veggetataive plants more compact and tighter internodes. I was wondering, since the first couple weeks of flowering are a vegataive stretch would it help them grow compact and tight internodes.