Phycocyanin and phycoerythrin ("phycobilins") are not present in terrestrial plants. They are found in cyanobactieria and blue-green algae. I have tried to persuade someone to engineer us some chimeric
that has these pigments, but it doesn't seem likely.
It is true that a lot of hort HPS seem like they are designed specifically for these pigments.
I think the "perfect" spectral distribution for flowering would follow the photosynthetic action curve exactly, at saturation intensity.
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Originally Posted by sientbob The spectral power distributions provided by many manufacturers may have been produced using 10 nanometre increments or more on their spectroradiometer. The result is what would seem to be a smoother (fuller spectrum) power distribution than the lamp actually has. This is because the gases or phosphurs used to actually give off the light have very narrow spikes at specific wavelengths. So we should be wary of this, and not be fooled by the smooth SPD curves supplied by many manufacturers. Basically anything with a gentle curve is misleading. |
Looks like the only way we are going to solve this problem is to shell out for a spectroradiometer and go around to the hydro stores testing lamps. How's your HC.com R&D budget?
Seriously, we should lobby AN to research lamps & publish data. Their growfaq contains pretty good info about lighting, right up to the lamp recommendation section, which consists entirely of manufacturer-supplied, uninformative blurbs. If they have chromatographs in house, a spectroradiometer should be no big deal. This would be a tremendous service to indoor
growers.
penguin