This page contains an ordered list of wavelengths pertinent to our discussions.
http://sevengens.com/id75.html
They may have specific implications in different growth stages in plants, possibly specific species.
They may also be convenient wavelengths of available LEDs,
often not exactly what you would prefer, but good enough to have the desired effect.
* 200-280nm or UVC radiation is harmful to plants.
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* 315 – 380nm is the UVA range
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* 320-340nm MAY have effects on cryptochrome.
*365nm a "wavelength of interest"
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* 410nm LED have no effect that we know of.
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* 439nm the blue absorption peak of chlorophyll A
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* 450nm Royal Blue is a readily available LED wavelength, commonly used to excite the remote-phosphor in LED lamps and is absorbed by one of the peaks in beta-carotene 450nm
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* 469nm the blue absorption peak of chlorophyll B
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> Chlorophyl both a and b have very wide absorption in the blue, between 430nm and 470nm is pretty much equally effective. You'll need a lot of this.
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*480-485nm second absorption peak of beta-carotene
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* 525nm this is a phototropic activator our researchers are still trying to find the chromophore of.... It is apparent the plants are gaining direction and environmental signals from it... it effects internodal distancing in ways which most folks may find confusing! 525nm is also the wavelength of GaN or InGaN green LEDs commonly used in RGB displays, or mixed with red and blue to get white light
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* 590nm Carotenoid Absorption... carotenoids are both starch storing, structural compounds and nutritional compounds. Jeffery Bucove increased the harvest bulk of his plants some 3 time by adding this wavelength.
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* 590nm phycoerythrin single absorption wavelength
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* 625nm phycocyanin single absorption peak
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* 642-645nm is the peak absorption point of Chlorophyl-B
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* 660nm Super-red LED wavelength --readily available sub for 670nm, multiple manufacturers, 1, 3 and 10W
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* 666-667nm this is actually the peak red absorption point for Chlorophyl-A
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* 700nm light is to be avoided. It confuses the Phytochrome recycling systems in green plants
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* 730nm for phytochrome recycling: needed for all kinds of morphogenic processes. A few minutes of 730nm light treatment after the full light cycle is over will revert the Pfr (activated) to the Pr (inactive) form of the phytochrome chromophore. This resets the chemistry for another lights-on cycle, and MAY be useful in shortening the classic dark side of the photo-period, fooling flowers and fruit into feeling a 24 hour day even though they got less hours of darkness than they 'think' they did...
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* 735nm is the closest available standard LED wavelength to the above 730nm
