I don't mean to argue but the science of the math speaks for it's self. There are times when you raise the light to promote stretch and then there are times when you lower the light for penetration. There is no one perfect measurement. The plants requirements will change to match each cycle in the development of the plant.

Side light top and bottom will provide way more light penetration then just one light above hoping to get lumens through the canopy. It's not what you saw; it's more like the perception of what you saw influenced you. You only observed one cycle or at most 2 cycle changes (if they even admit to the cycle of life grow technique, not everyone agrees. Some are stuck in the past and fail to see the forest because of all the trees in their way)

Dutch masters have done exhaustive work in this field while developing their new Hydro feeding product. From the reports I am hearing and reading they have some of the very best nutrients around for hydroponics. There are a few I know who are using their product in their KBS systems and having tremendous success. I have not change or tried any yet myself but I have an order on the way for next time.

Light distant is still dictated by temperature under the light measured at the top of the canopy on average height. Light penetration is still in the math. After that all you can do is all sidelight if the canopy is too heavy for proper top light penetration. Common sense comes into play here only because the plant sucks at math. You can see with your eyes if there is enough light penetration so add sidelight and then guess whatâ?¦no problem.