cdgmoney250
Well-Known Member
So I've been spending some time thinking about the optimum light levels our plants need based off of Light Cycle Duration and also what stage of growth the plant is in. According to my quick google searching, most mature 'High Light' plants require 12-18 Mols/ Day and 'Very High Light' plants need 18+ Mols/ Day of light for best growth, with cannabis being the latter of the two.
https://www.extension.purdue.edu/extmedia/ho/ho-238-w.pdf
I've also read on numerous 'forums' that flowering cannabis DLI saturation is between 20-30 Mols/ Day, but I haven't yet found any proper documentation backing that claim up.
But, if there is a hint of truth to this claim, it might explain a lot of the light stress that folks are seeing on their plants.
The formula for determining DLI:
So... (850 x 12h x 3600) / 1,000,000 = 36.72 Mol/ Day
So based of this observation, are the plants receiving too much light?
Could the same results/ plant health/ yield/ quality be achieved with less light?
I remember @captainmorgan saying that his canopy received about 550 μmol he had some awesome results. That is about 23.76 Mol/ Day.
I know that plants outside in direct sunlight can receive much higher DLI, but there are many other variables with growing outside. This discussion is more about indoor DLI requirements.
I hope to determine some sort of 'DLI standard' so we can have true target light levels to aim for.
https://en.wikipedia.org/wiki/Daily_light_integral
http://www.apogeeinstruments.com/daily-light-integral-measuring-light-for-plants/
https://www.extension.purdue.edu/extmedia/ho/ho-238-w.pdf
I've also read on numerous 'forums' that flowering cannabis DLI saturation is between 20-30 Mols/ Day, but I haven't yet found any proper documentation backing that claim up.
But, if there is a hint of truth to this claim, it might explain a lot of the light stress that folks are seeing on their plants.
The formula for determining DLI:
- DLI (mol/m2/day) = average light intensity (μmol/m2/s) · time (in seconds) / 1.000.000
- DLI (mol/m2/day) = PAR · h · 3600 / 1.000.000
So... (850 x 12h x 3600) / 1,000,000 = 36.72 Mol/ Day
So based of this observation, are the plants receiving too much light?
Could the same results/ plant health/ yield/ quality be achieved with less light?
I remember @captainmorgan saying that his canopy received about 550 μmol he had some awesome results. That is about 23.76 Mol/ Day.
I know that plants outside in direct sunlight can receive much higher DLI, but there are many other variables with growing outside. This discussion is more about indoor DLI requirements.
I hope to determine some sort of 'DLI standard' so we can have true target light levels to aim for.
https://en.wikipedia.org/wiki/Daily_light_integral
http://www.apogeeinstruments.com/daily-light-integral-measuring-light-for-plants/