bob harris
Well-Known Member
CMH is great at providing both spectrum's. Less lummens, but plants don't care about lummens. They care about PAR, and cmh have great par value.
The main reason I don't use them is that I had the hps already. I first tried adding mh reef bulbs (deep blue, 430 to 460 nm) for the spectrum, but didn't like cooloing the extra heat produced. The led's are way low heat, and their small size allows easy positioning. I'd never recommend led's as a total light source, but they work well as side lighting or supplemental. Led's have limited foot print and penetration for use as total lighting in my opinion.
Some day, as cmh becomes available in higher wattage's..it may prove a very useful growing bulb.
