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PharmHand
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Unnatural light spectrum unnatural nute usage. Intensity would exacerbate any imbalances. Plants evolved to use the suns spectrum and can probably effectively use more light with a better CRI. But at the same time can only EFFICIENTLY use so much light. Studies show cannabis grows better at 1500umol or less. Having lights too close can easily exceed 1500umol. DLI must be considered too, in nature it ain't high noon all day long.....Photon colors hit photo system 1 and 2 and chlorophyll a and b differently which changes the cycle speed and the secondary metabolite usage. Has nothing to do with intensity.. in more intense light you use less nutes to prevent stoma gas off burns. Different light color makes a plant use nutes different.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3949401/
This is a good point... your uv index and spectrum mix and intensity changes constantly outside moving through the arc of atmospheric particles. Indoors you drill a plant with the exact same light throughoutUnnatural light spectrum unnatural nute usage. Intensity would exacerbate any imbalances. Plants evolved to use the suns spectrum and can probably effectively use more light with a better CRI. But at the same time can only EFFICIENTLY use so much light. Studies show cannabis grows better at 1500umol or less. Having lights too close can easily exceed 1500umol. DLI must be considered too, in nature it ain't high noon all day long.....
From your link:Photon colors hit photo system 1 and 2 and chlorophyll a and b differently which changes the cycle speed and the secondary metabolite usage. Has nothing to do with intensity.. in more intense light you use less nutes to prevent stoma gas off burns. Different light color makes a plant use nutes different.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3949401/
Are we talking about excess light or spectrum to nutrient balance? Excess heat effects the plant different than light color/spectrumFrom your link:
However, excessive light generates oxygen radicals and causes photoinhibition. Both phenomena strongly limit primary productivity [6].
that is rust fungi.. not a light problem.Same here
alot has changed in 4.5 years,specifically lighting indoors :happy:Whatever you decide on, keeping a grow journal in handwriting will help you tune and refine technique for more favorable outcome as you get deeper down the rabbit hole
I agree, exotic spectrum controls are now available for LED. Learning curve is steep but the rewards are crazy! Less heat and power costs.alot has changed in 4.5 years,specifically lighting indoors :happy:
So I have this tree I am growing and it is surrounded by (4) 1000w bulbs.
2 MH and 2 HPS.
Plant tissue (leaves) being pummeled with HPS light are showing what looks like a P deficiency (brown spotting, purple petioles etc)
Leaves hit my the MH do not show these symptoms. This is on the same plant.
So by this observation I am wondering if an HPS spectrum (more red?) causes the plant to take up more P...
Where the botanists at yo!? I am super curious about this.
Red and far red have the greatest impact on photosynthesis...causing the plant to drink more...
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