I believe they were going to extremes to show what main componenets of CLI PAR light a plant uses to bulk...throwing some shade at diodes marketing for sure...
They went as far as acknoledge that green light wasnt apart of the experiment in terms that the metabolic process that absorb it doesnt depend photosynthesis effciency, where blue and red do
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but only
in-vitro (solvent) -
in vivo it's actually not that pronounced.
this is one of the greatest "myths" still in, say, almost everywhere, and seems to dominate the industry + its designs.
but the chlorophyl-molecule consists of a disc + tail, the latter being used to transfix it to a protein and arrange its spatial position inside the light-harvesting complex. which greatly changes its absorption spec and allowing other/higher stable excitation state(s).
then the core or antenna organize the placements of these chlorophyls to form an "electronic funnel" towards the trap - with surplus energy making it possible the exciton "travelling a longer way", better: being able to cross greater distances...jumping from & to the outer electron spheres.
It would surprise me if just blue+red resulting in best photosynthetis rates, I remember a study with blue, yellow & red to score highest.
let me just search on my desk for a pic
