I donāt even get why someone would hang a quantum board that far from their canopy. The whole reason quantumās are more efficient is because they can be hung closer to the plant and waste less energy by doing so. By hanging the fixtures so high they are losing the advantage and might as well go back to HID to get better results. Imo itās a mixture of old school growers still adjusting to new school technology. But thatās my opinion.
From the original video, and physics, the reason one would hang a light, any light, further from a canopy is that it reduces the differential in light strength between the top of the plant and lower in the canopy. Because of the inverse square behavior of light strength, if the top of a plant is 1 foot from the light source, and the bottom of the plant is two feet further, the strength of the light at the bottom of the plant is 1/9th that of what the top receives. If the top of the plant is 2 feet from the light, and the bottom is 2 feet lower, the bottom receives 1/4 of the strength. If the light is 3 feet from the top, the bottom would receive (reaches for calculator) about 36% of the light. So its a light gradient thang.
As to bud hardness, I have never gotten higher from bud hardness. In my considerably less than humble opinion, this is a cosmetic characteristic that the commercial market currently values that is absolutely unrelated to what I, as a smoker and personal use grower, care about. I hate smoking rock hard buds - they don't burn as cleanly. So, I, for my personal plans, don't manage towards this. But that's just my thing.