Quote Originally Posted by bigsby
It is worth noting that you can not evaluate LEDs by looking at lumens. Plants don't care about lumens.
You can't rate any monochromatic light source by the lumen, since the lumen is weighted against 550-555nm wavelength light as emitted by a blackbody radiator. The best most horticultural lamp manufacturers will tell you is the watts per square meter output, not the umol output per square meter per second, which is what really matters.