So seventh, what are you talking about? We are on subject, but it seems you want to change the subject to...genetics vs enviornment? I agree with the genetics being the cornerstone, and you can't get quality from crap...but it's not the only factor. Any gardener can screw-up a garden, regardless of the quality of the genetics you start off with.

I think y'all are underestimating the cannabis plant. Not only has it lasted many thousands of years, it has seen shitloads of different climates, CO2 levels, earthquakes, droughts, floods, terrain elevation changes...and all we have to do is keep it's conditions in a certain range. (not like orchids, that demand a hot, humid envirornment for example) Even the femming process shows the determination of the cannabis plant to survive extreme conditions. If not, we wouldn't be able to stress nanners into the females, and calyx's in the males. It's a latent expression of emergency reproduction, being forced-forward to an overt expression.

Things to ponder while you're dicking with spectrums...
Is shifting light spectrum in one direction or another a benefit, or is there another price to pay for this shift? (growth habits, disease resistance, stress tolerance...) Especially during the growth phase. How much of a shift works or doesn't work? How many specific wavelengths are there between ultra violet, and infra red? Are all these wavelengths covered when using LED's? If not, is it a benefit, or a curse? Does shifting the spectrum have any genetic repercussions long-term? Should you go with something that's been proven, or keep looking for a non-existant "better option"?

How many different wavelengths do LED's come in? How many of those are affordable? Which combination(s) are most beneficial during growth phase? How about for flowering? How about for seed-set and seed maturation? How do you know the LED's are perfectly within advertised range?

Is there a "sweet spot" of spectrum combinations...? Yup. It's called the sun. Add or subtract from that, and your plants will adapt, but at what cost? (if any)

I'm not at all saying it's bad to experiment. I do it often. If you have the time, money, growrooms, time, knowledge, money and time to pull it off and find the "perfect" LED combination...have at it. It's worthwhile if you can successfully pull it off, and likely you'll get some positive rep points for your efforts.
But quite frankly, I'll stick with a proven winner (HPS) till the industry comes-up with a better mousetrap.

In adding UV light late in flower I know the exposure risks, (to my eyes and skin) but I also know the effects on my plants, and welcome them. Were I to listen to the PSII paper, I'd be talking out of my ass touting "proof" of photodamage, and I wouldn't be enjoying the benefits, and I wouldn't have the hands-on experience with the UV spectrum that I have. Experiment away (safely)...but keep plant biology and physiology in mind, or you are likely wasting your time.