Now, once again, we'll try to figure things out together!
This is not about the vertical method of cultivation, but specifically about the method of "Sphere". The way that I use.
We have two types of lighting: LED and Sodium lamp.
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There are four plants: A, B, C, D
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The sodium lamp (here everything is clear, all plants get evenly across the entire surface of 600 watt of light.)
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But with LED does not work all smoothly:
So (Only one plant receives 600 watt of light throughout the plane.)
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So (in this case, only the upper part gets a total volume of light of 600 Watts, the lower ones are much smaller.)
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Or so (if you divide the panel into four parts, you get 600/4 = 150 watts per plant or 4X600 = 2400 watts in total.)
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My conclusion is simple: LED in the form that it is not suitable for cultivating Sphere - the most productive way in terms of parameters: light / area / yield.