Can only speak on topics I'm familiar with. I know nothing about LED's. Never owned or worked with em. I was addressing the OP's original question... to which my answer is spot on.
I can't comment on how the CMH compares to LED. I defer to you since you apparently run LED.
Best
LH
Not picking on you. Most growers know very little about light spectrums and/or intensity, and its affect on cannabis
Umoles has nothing to do with the type of light, umoles is a unit of measure quantifying how many photons reach the canopy in one meter square, at one foot intervals from the canopy.
With a properly designed LED panel there is no comparison, as 100% of its' output is directed at the canopy