You can use both for veg and flower. What promotes flowering is when you change your lighting to 12/12 from 18/6.

I use MH and HPS during both stages....just during the flowering I add on an extra 800W of HPS and I still use the the 400W MH.

Have a good grow!:jointsmile:
Psycho4Bud Reviewed by Psycho4Bud on . red 4 veg? just to make sure i dont mess up i am currently using 1 250w cfl blue 6400k for veg i just purchased 1 250w cfl red 2700k for future flowering im thinking can i use both for veg? red and blue and can i use both for flowering? Rating: 5