Epic 4x4 Flowering Smackdown : 96 Elites vs 288s

Randomblame

Randomblame

Well-Known Member
led1k said:
I emailed them and it's been 2+ weeks. Not too surprising but it was worth a shot. Found:
https://www.waveformlighting.com/horticulture/convert-lux-to-ppfd-online-calculator

I chose the only 3500K option (Low CRI LED 3500K) and entered 60K lux...

Result: 962.22 umol/s/m2

Does it pass the smell test? Assuming it's a fairly accurate guesstimate I'm surprised it's that high. Readings taken at top of plant at 7". No signs of light stress so I could go closer?
Click to expand...


Or_Gro said:
I have no idea...3000K for 60k lux is 1142 ppfd, using that calculator....you might see some burn at 1142, less likely w proper acclimation at 962...so, you’re closer to 962 than 1142, i’d go with 3500K until you get better info...

Calling @Randomblame: any comments
Re lux -> ppfd conversion factor for Bridgelux EB Gen 2's
Click to expand...

Hmm! When the dividing factor is ~69 for 3000°k/CRI80 60klx would be ~870μMol/s/m² and with 70 for 3500°k its around 857μMol/s/m². This calculator is pretty useless because it does not factor in hanging height, area and all that. It also weighted to give their own product much better results. But CRI90 can not reach more μMol/s like CRI80 unless you compare calculated YPF/w values or older less efficient diodes. If CRI90 would be more efficient like CRI80 we all would have used CRI90 from the beginning.
I would not trust this tool.
The 60klx is also only a point measurment and shows only the intensity at this spot but not what is available for the whole plant/area at different hanging height.

Try this one... Simply enter the calculated lumen output, spectrum, area and hanging height into the according fields and tap calculate. Nice tool to play with..

http://dev.edman007.com/~edman007/pub/par-dli-cal.html

Works much better and works with white and monochromatic diodes BTW. But not at the same time.. You need to calculate additional mono's separately.
 
Or_Gro

Or_Gro

Well-Known Member
Randomblame said:
Hmm! When the dividing factor is ~69 for 3000°k/CRI80 60klx would be ~870μMol/s/m² and with 70 for 3500°k its around 857μMol/s/m². This calculator is pretty useless because it does not factor in hanging height, area and all that. It also weighted to give their own product much better results. But CRI90 can not reach more μMol/s like CRI80 unless you compare calculated YPF/w values or older less efficient diodes. If CRI90 would be more efficient like CRI80 we all would have used CRI90 from the beginning.
I would not trust this tool.
The 60klx is also only a point measurment and shows only the intensity at this spot but not what is available for the whole plant/area at different hanging height.

Try this one... Simply enter the calculated lumen output, spectrum, area and hanging height into the according fields and tap calculate. Nice tool to play with..

http://dev.edman007.com/~edman007/pub/par-dli-cal.html

Works much better and works with white and monochromatic diodes BTW. But not at the same time.. You need to calculate additional mono's separately.
Click to expand...
Thanks RB!
 
Or_Gro

Or_Gro

Well-Known Member
M

mr. childs

Well-Known Member
Or_Gro said:
@Randomblame telks me that it’s not just the strength, but also the ratio of uvb to uva, that causes a problem with these

A couple informative links...

Two important and synergistic wavelengths:
https://www.agricultra.com/secondarymetabolite

Uv THC mechanism;
https://news.californialightworks.com/uvb-light-and-thc-potency/
Click to expand...
for years i wanted that clw 440 with the tubes on each side, but none of the shops around me carried it. i wonder what bulbs they used? how long do you think it will be before the arcadia bulbs start to deteriorate the plastics & fibers in the tent?
 
Or_Gro

Or_Gro

Well-Known Member
mr. childs said:
for years i wanted that clw 440 with the tubes on each side, but none of the shops around me carried it. i wonder what bulbs they used? how long do you think it will be before the arcadia bulbs start to deteriorate the plastics & fibers in the tent?
Click to expand...
I have no idea, but expect the equip will break on it’s own before deterioration under Arcadias... they aren’t that strong and i have them at a distance away....

But, at some point i guess i’ll learn.
 
Or_Gro

Or_Gro

Well-Known Member
mr. childs said:
that metarail wants you to place it 10'' above the canopy, will you need one over each plant if you decide to purchase them ?
Click to expand...
I don’t intend to buy any of these prods, posted for the supporting knowledge. I like my 4’ arcadia 14%s at 22-24”, where plants are apparently not damaged but getting good intensity....

I’m already at/beyond the daily exposure of the top end in one of the studies...i’d have to dig out the algebra conversions @Randomblame gave me in a post somewhere to get exact numbers....can’t remember where it is...
 
Or_Gro

Or_Gro

Well-Known Member
I keep coming across CBGs in my readings...they are precursors to THC and CBD...

apparently so much in drmand by plant that usually there is only about 1% available at any point in time for most strains....

I’ve read that they can be increased by uv and that certain strains have signif more than 1%... trainwreck and greencrack are two of these higher cbg strains....

Here’s an intro:
https://www.leafly.com/news/cannabis-101/what-is-cbg-cannabinoid
 
StickyBudHound

StickyBudHound

Well-Known Member
Or_Gro said:
I keep coming across CBGs in my readings...they are precursors to THC and CBD...

apparently so much in drmand by plant that usually there is only about 1% available at any point in time for most strains....

I’ve read that they can be increased by uv and that certain strains have signif more than 1%... trainwreck and greencrack are two of these higher cbg strains....

Here’s an intro:
https://www.leafly.com/news/cannabis-101/what-is-cbg-cannabinoid
Click to expand...
Sounds like you would need to harvest a few weeks early to extract it before it starts turning into CBD and THC.
 
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