Hey man this reminds me of something. I bought my first generic Chinese Blurple UFO, 45 LEDs at 3W and it has a lot of hours on it. Around 2010-2011. It grows decent weed by itself though I've always used it as supplemental with CFL or HPS after the first Grow. I paid well over $100 bucks for it and it still works.
To the point.
When Blurple first came out I fell hook line in sinker for the marketing. NASA studied Blurple too I think. See, supposedly, Blurple ONLY uses the exact spectrums the plant needs. No wasted energy on green or whatever it doesn't need. It was designed to be efficient around the known "Science" of the plant of the time. Well. HPS proved that theory wrong in the real world over and over again. Maybe not wrong, but HPS did better. COBs weren't talked about back then.
So now we have true full spectrum LED COB. Which is dialed in to be a little more red or blue depending on preference or in our case requirements of use. And it has all of these other spectrums that at one time some may have believed was a waste. Since the science of plants thought supposedly the plant doesn't use those other spectrums at all. And I think at this point that science has been proven wrong. Perhaps more red and blue benefits the plant. But, doesn't mean those supposedly wasted spectrums aren't used somewhere at the molecular level of the plant. Life evolved under the full spectrum of the sun and science is still early to be making definitive conclusions down to the molecular level. Science is amazing though. Just saying. The Blurple theory may not be definitively wrong. It just isn't perfectly right yet.
Now I still use my second Blurple UFO 60x3w circa maybe 2011-2012 and it still works like a charm too. But, several years ago I bought a small HPS. I use them both together. My theory. You have that full "warm red" spectrum from the HPS and those specific spectrums designed around what spectrums science think plants need the most from Blurple.
Those Quantum Boards are very interesting. I wonder how long it will be before the Science guys who designed the light that seems to work very well based on others reviews here. And I don't question that they do. But, in the LED world rarely does anything stay the same. How long will it be before they "improve" upon the design by updating it with an extra red or blue here and there. Like some of the DIY cobbers do.
Sell two models. One all white and another with a little Blurple. Make everybody happy.
I've been an eBayer for at least a decade and a half. And purchased many things from China. They all worked and still do after YEARS of use. Only recently have I ever been burned from China. My 2 110v, 50w COBs I paid $4.22 mid December still haven't arrived lol. I'm not mad though. It's the Chinese New Year right? Maybe it will come.
Next on my plate? A single higher power COB. Maybe 50-150 watts Probably with parts from you. I don't hang my lights overhead in flowering. I hang them on the side. I usually grow 2-4 plants. So. Efficiency isn't a big concern. And I rotate the garden every day so, they get a little more of this one day and a little more of that the next. It works really really well. But, I get bored and like to tinker too.
I only really know that to grow weed indoors you need light. I use other people's R&D. When you go straight 12/12 like me, you're not worried about yield. You're sharing that goal with speed. And electrical use is pretty much inconsequential tho, you don't wanna be ridiculous either by wasting. 2 onions per plant are expected in as little as 8 weeks. I have gotten 4 tho from a single. Only once have I ever gotten under 1 onion except that time I trimmed flowers all the way through the last 4 weeks lol. I still got an onion and half the plant was gone at harvest! Haha.
Anyway, Just saying man. You're a science guy. Perhaps us hobby guys just wanna grow some dank sir. And we're doing it my brother and them flowers are delicious, plentiful for personal and tight too.