a cmh should only be used like, inbetween goin from veg to bloom for a week , say your runnen 18/6 mh drop down to 16/8 for a week before 12/12 under just hps, plants get darker green and harden off better before the intense hps your bought to hit em with, uvb lighting in nature is highest in summer (veg) not bloom, (more natural high following nature) i tried vegging with cmh but the particular strain and cut i run kicks out way to many hairs in veg, my cut needs strictly white light in veg even leds fuck em up,