You are correct to a degree . The problem with Umol is it doesn ' t represent a quantifiable amount of light . umol is reading the density of photons coming off 400700 nm . So it gives all colors the same amount of intensity . I can take a dead green LED put 200 watts in it and show you u Mol readings that will make you think it ' s a good lamp but really it isnt . Even though lumens are for humans they both still measure between 400700 nm . Sure , the lumens and lux meters are more calibrated for yellow but on a general consensus lumens is very much the standard . when a grow light manufacturer posts only u Mol readings it doesn ' t say a damn thing about how much quantifiable light is coming off the fixture that ' s why u still need lumens . And only recently did manufacturers start using Umol simply for marketing to the horticulture industry . And NO fluence does not provide both . No where did they put their lumens output and LPW . I heard the fluence was a decent light great for small plants . I ' m a large plant grower myself which is why I chose spectrum king . And they are partnered with CREE . Can ' t beat that . Being backed by a 7 billion dollar company and practically the creator of the white LED . Sorry I will stick with people who got the science right from day 1 . Not follow a company who knows nothing and just copied what others do .