you can use an HPS bulb for veg without flowering the plant, mh is just better, its 12/12 that will turn the flowering on.
llamaman666 Reviewed by llamaman666 on . Mmm there doing quite well! Light cycle... Q's When again is a good time to switch to 12/12? These suckers are going to be bushy, there really healthy, probably 5" tall now, lots of nicely colored leaves. Still on 18/6..... Rating: 5