I might be missing something here, but regarding low kelvin not being favourable for photosynthesis, my dad's HPS lights in his greenhouse are what I expect is about 4,000k, almost red.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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