This is talking about an apparent brightness with measurements in Lumens where the eye’s RGB sensitivity has already been factored in to the measurement. All I can contribute is that when I’ve adjusted RGB power in mw to correct for the eye’s sensitivity & matched the beam sizes my Lumia were nicely matched in term of intensity.
Wetware at work...
"There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso