Well my fellow DE hps/my and other cake growers. It appears these quantum board fellas ...
... are onto something here lol my new 480watt came in today and well it's so damn bright. It surprised me, these QBs are nothing like the blurple lights I wasted over 2 grand on 550 a light. So I did a fun lux meter test and this was the results. (1000watt MH running at 600, 315CMH and my new 480watt QB.)
This being said I will still use my DE hps/MH and all my other lights but this QB board is a great add on
For all my fellow hps/mh growers if you dont believe me just order a cheaper one and try it for yourself. (I run abunch of DE hps 1000watt lights in flower and it still surprised me)

HPS is still the work horse of the industry, but i predict in 15 years they will be barely used. While Blurple will be gone in 2 years. Im not sure about the LUX, but I do think it is about the PAR.
Lux readings mean absolutely nothing when it comes to quantum boards.
well shit. Lol found the little machine at the place so I thought I'd try it Haha