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SmithsJunk
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Good, clear info here about par and all.
https://www.thcfarmer.com/community...-for-humans-about-par-ppf-ppfd-and-dli.84822/
Sweet, thanks
Good, clear info here about par and all.
https://www.thcfarmer.com/community...-for-humans-about-par-ppf-ppfd-and-dli.84822/
Good, clear info here about par and all.
https://www.thcfarmer.com/community...-for-humans-about-par-ppf-ppfd-and-dli.84822/
So this is the diagram for my CXB3590x2 (actually it's for the CXB3590x2II, it's the same fixture with some digital additions but the lighting components are the same)
View attachment 845977
My light is close to 8" away and it's footprint at this distance is 7.5'sq. My canopy is less than 6'sq and the Mylar is 99% reflective (I wonder if that is 99% of PAR or all light, or if there is any difference in reflection between the two), so I should be getting most of 2500micro mols per second. So 2500 × 0.0864 = 216 (DLI), and since I'm running my lights 12hrs then my DLI at canopy height is around 108 moles, right? Seems like an aweful lot. Am I missing a calculation somewhere?
Am I at least on the right track here. Should I be dimming my lights by nearly 40% to be getting better photosynthesis? I can do that and was during veg. My single is already running at 67% of my double. Do I need CO2 generators at this rate or would that only be if they were indoor?
Good question. Never delved into dli calculations and ppfd myself. But if that values are correct -by the way, these companies usually take direct readings under the cobs and serve it as the ppfd value, which doesn’t give the whole story- then your calculation seems right. But to get actual dli values you should have a quantum meter or a detailed ppfd chart. All in all i think you can dim it a bit. Maybe to 70%?
This is a very confusing calculation because you are taking spot measurements but use m2/s. The sensors are tiny not m2 but cm2 :DHahaha, I just did to 75% because one of my girls is at around 11-12". Perfect man. Thank you so much. It's great when you begin to understand and aren't just guessing anymore.
@jumpincactus can help tho i’m sure :) to both of us :D
My brain is like, "Okay bud, that's enough from you today. Go get me a bowl now. I earned it." Hahaha.
Cactusman, lowers his head, puts hands in pockets and walks away feeling so neglected, abused and unloved...……. Nobody loves the Cactusman. lmfao. :(:cry: And thats fine Mr. Smith, :D when ya really need me I'll be in abandonment therapy and not able to help when you need me the most.:p LOLNo reason to get Jumpincactus involved yet. I'm just breaking through and am going to do a lot more studying. My brain is like, "Okay bud, that's enough from you today. Go get me a bowl now. I earned it." Hahaha.
Cactusman, lowers his head, puts hands in pockets and walks away feeling so neglected, abused and unloved...……. Nobody loves the Cactusman. lmfao. :(:cry: And thats fine Mr. Smith, :D when ya really need me I'll be in abandonment therapy and not able to help when you need me the most.:p LOL
Cactusman, lowers his head, puts hands in pockets and walks away feeling so neglected, abused and unloved...……. Nobody loves the Cactusman. lmfao. :(:cry: And thats fine Mr. Smith, :D when ya really need me I'll be in abandonment therapy and not able to help when you need me the most.:p LOL
Awww come on mr. cactus, we love ya :D
I found this write up,
For cannabis, bottom threshold for optimal growth and photosynthesis is a DLI of DLI of 22 would be:
****Going lower than these numbers will still grow cannabis, however yields, bud density, potency and THC percentage may suffer.
24/0 schedule: 254.6 micromoles/m2/s-1
18/6 schedule: 381.5 micromoles/m2/s-1
12/12 schedule: 509.25 micromoles/m2/s-1
For Cannabis, the Top threshold for optimal growth and photosynthesis is a DLI of 65 moles per day.
***extremely important notice, only go up to these amounts if you are using supplemental CO2, do not go this high if you are not using supplemental CO2 as you will actually slow down photosynthesis and waste energy.
24/0 schedule: 752.31 micromoles/m2/s-1
18/6 schedule: 1128.465 micromoles/m2/s-1
12/12 schedule: 1504.6 micromoles/m2/s-1
The generally accepted guidelines for artificial light PPFD in flowering are this:
in a 12/12
PPFD of at least 510 micromoles/m2/s-1 for the low end of optimal intensity
PPFD of at least 800-1100 micromoles/m2/s-1 for perfect optimal lighting without additional CO2.
PPFD of at least 800-1500 micromoles/m2/s-1 for perfect optimal lighting WITH additional CO2.
im looking back at this from yesterday and it is Clear I was friggn toasted. :D:smoking::fire::fire::fire: I love cannabisAwww come on mr. cactus, we love ya :D