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They also have videos saying that there is no better than metal halides.This got away from your questions
if you have basic black boxs you will have a hard time getting growth with those LEDs. They are not going to get dialed in or diffuse light well enough to get good growth. At least I wouldn’t be confident using them for growth.
BRS has lots of investigations on LED placement with PAR readings from all the major LEDs. They go over tank sizes, number of lights, height, and intensity. I suggest watching a few videos. They can explain everything much better than anyone in here can or has.
They published some great videos showing T5s too.
Their videos are made to sell what they have in stock.
PAR alone doesn't (or at least shouldn't) dictate what is the best quality light for your reef tank.
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