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Maybe this will help you see the light since you don't understand the sun light example.

IF you had enough light to have great PAR from 20 feet above can't you realize that the area of great PAR would have expanded vertically past what you would get from lights closer to the plants?

You have to be able to wrap your mind around that science.

I just lose patience when you close your mind to the obvious. 

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So then how can we make this work for low ceilings?

Cutting edge science right now for plant lights is incorporating different magnifications for different LED bulbs in the same fixture.

This concept also stretches out the vertically range of great PAR by focusing at different depths. 

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Here's what is behind the science of making lights more like the sun;

Resonant Rayleigh light scattering of single Au nanoparticles with different sizes and shapes

 

Abstract

Scientific interest in nanotechnology is driven by the unique and novel properties of nanometer-sized metallic materials such as the strong interaction between the conductive electrons of the nanoparticles and the incident light, caused by localized surface plasmon resonances (LSPRs). In this article, we analysed the relationship of the Rayleigh scattering properties of a single Au nanoparticle with its size, shape, and local dielectric environment. We also provided a detailed study on the refractive index sensitivity of three types of differently shaped Au nanoparticles, which were nanospheres, oval-shaped nanoparticles and nanorods. This study helps one to differentiate the Rayleigh light scattering from individual nanoparticles of different sizes and/or shapes and precisely obtain quantitative data as well as the correlated optical spectra of single gold nanoparticles from the inherently inhomogeneous solution of nanoparticles. These results suggest that the shape, size and aspect ratio of Au nanoparticles are important structural factors in determining the resonant Rayleigh light scattering properties of a single Au nanoparticle such as its spectral peak position, scattering-cross-section and refractive index sensitivity, which gives a handle for the choice of gold nanoparticles for the design and fabrication of single nanosensors.

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