The "dubious" part in these grows was using regular household screw-in light bulbs from Walmart or Home Depot to grow weed indoors.
My point was that whether quantum boards or HPS or other light sources are used, as long as your plants receive enough light of adequate spectrum they will live up to their genetic potential with everything else being equal. That's why I think this entire "this vs. that" thread is stupid. Both LED and HPS have advantages and disadvantages, with the disadvantages of each offset by using the appropriate setup. You can get superior penetration by raising a powerful HPS far from the plants and blasting them if headroom isn't an issue and heat is mitigated. There is no question however that LEDs are more efficient, with the ability to provide more coverage in setups where headroom is limited. It may simply be the price of electricity in someone's province or state that influences the choice in lighting technology.
Even the argument of seeing a "side-by-side" to prove something IMO is silly simply because a plant grown to its genetic potential with whatever lighting technology you use will show similar results, provided you have identical genetics and environment. And yes, both LED and HPS are fully capable of growing a plant to its full genetic potential from my experience.