Honestly cannot vouch for the CMH route yet it's my first full run with them, had to mix a 600hps few days ago to maintain warmth without adding a heater, working great, sure wish I had a heat exchanger, but it's a shoestring operation at best lol, bought the 315cmhs off craigslist for $50 each including Phillips bulbs they only had one run on them, was a sweet deal....I can say the OBS blew up with just the cmhs grew into the vertical bare bulbs two different times overnight, plants are very bushy..