That is an interesting article. There is a big problem with it. They only used the "generic" label "white LEDs". They didn't specify anything about different kinds of diodes or anything like that. There are many different kinds of white LEDs. Samsung is at the forefront of the diode game.
The recent most current top of the line diodes are the Samsung LM301Bs. That is what is mostly used on HLG's V2 boards. They are vastly more efficient, and effective then any diode currently being used in grow lights, with the exception of the diodes that are used in the QB 96 Elite V2s. With a mix of different colored diodes, they offer a wider spectrum than standard 70 CRI, 80 CRI and 90 CRI LEDs. The red diodes are probably Nichia, but I believe the whites are Samsung LH508Bs, for increased wattage capacity.
Now, if they used, and named, these top-of-the-line diodes for their test, I would take the test more seriously. But I know from my own personal experience, that I was flowering in 18 square feet with dual 600 watt HPS. I was averaging 1100 grams. I switched to 960 watts of QB132 boards, and now I'm averaging 1350 grams, and the nugs are denser and stickier. This is growing the same strain, flowering from clone, in 2-liter SOG, 96 plants per run. So, I know that that test is not accurate.