Subbed to both, thanks! However, those are both Quantum Board threads... what about LEDs?
CRI test and Mcree weighted results
- Thread starter Rahz
- Start date
nfhiggs
Well-Known Member
"Turns out that there are other things more important than photosynthesis."
I think that is what many of us (myself included) have been trying to say. If I was using plants to create O2, then I would try to maximize photosynthetic efficiency, but that is not my goal, my goal is to maximize THC production.
I think that is what many of us (myself included) have been trying to say. If I was using plants to create O2, then I would try to maximize photosynthetic efficiency, but that is not my goal, my goal is to maximize THC production.
BuddyColas
Well-Known Member
They are LEDs...just mid-powered LEDs and not COBS. The plants don't know that, so it should be a good test by a couple of good growers.
Sorry you're right, I should have said COB LED setups... It's been a long day... anyways, that makes sense I suppose.
BuddyColas
Well-Known Member
And interestingly there seemed to be a big difference when using and comparing the 80/90 cri cobs...but not so much so far with the mid power Samsungs. Things that make you go hummmm?
Thanks, could you possibly provide a link to make it easier? On the phone right now and navigation isn't nearly as easy as on a desktop/laptop (for me at least).
Rahz
Well-Known Member
It's this thread
I went through all 21 pages last night (now at 22) and to be honest... I'm not sure what the conclusion is. Haha!It's this thread
It looks like it is still all under discussion with some of the companies releasing LEDs with better specs, etc. I have enjoyed the couple side-by-side grow threads which have been linked previously. That is white interesting to see.
Rahz
Well-Known Member
Yea, my test was just one and wasn't as well controlled as it should have been though they all shared the same reservoir and the high CRI samples had better looking/smelling product. I'm still unsure of the yield efficacy but there does seem to be something to high CRI in other respects. More testing is needed all around.
For my part, I'm not very biased one way or the other. I was actually rooting for the 3000/80 lamp since it's the spectrum I had been selling for the better part of a year.
For my part, I'm not very biased one way or the other. I was actually rooting for the 3000/80 lamp since it's the spectrum I had been selling for the better part of a year.
Is the 2nd test still ongoing or has it not yet begun?
ttystikk
Well-Known Member
Ouch. Sorry to hear that.
Well that's awfully scummy! I'd be more than willing to run a test for you, but I'm a newbie grower just getting started.
BuddyColas
Well-Known Member
Not sure how to calculate YPF from the SPDs of the 5000K and 2700K LEDs. You'll have to wait for a bigger brain to answer that, BUT $10.76 (Digikey price) for 48 watts of "tune-able" LED strips sounds very interesting!
OK, so until a real brainy mathematician addresses your question, check out this thread:
https://www.rollitup.org/t/par-multiplier-thread.928907/page-2
I'm saying with the multipliers provided in that thread, and at 49 watts for both channels running at 1 amp., that the strip produces a tad more than 2.2 umols/joule. Not bad!
And with those same multipliers, the F564B comes in at a bit over 2.4 umols/joule, BUT watt-for-watt it costs over twice as much as the VESTA strips.
EDIT:
I don't know how I missed the VESTA strips, but they looked so good I ordered 6 of them for a potential 300 watt fixture for my 2x4 foot tent. Details to follow.
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tazztone
Active Member
YPF difference between VESTA and F564B 3000K is 18% @ 49.6W.
the price difference on digikey is 61%
or 56% for 10pcs
or 50% for 25pcs
Vesta gets you double the amount of photons per dollar.
here the calculations by LivingLight, with a combined graph for Vesta, compared to 3000K F564B
(PS Vesta price should be 10.7$)
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BuddyColas
Well-Known Member
Looks like you and Mr. Internet have been spending some quality time together! No doubt the 561C is near top dog in efficiency these days.
This will be my first foray into CRI 90 LEDs and definitly into a "2 spectrum" strip. I like the idea of going heavy on the 5K and light on the 2.7K for veg and vice versa for flower.
I do have an Apogee par meter, so it will be interesting to compare the par/watt delivered to the canopy of the VESTA strips compared to my EBs and Vero 29s.
Thanks for sharing.
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tazztone
Active Member
the problem with this apogee par meter is that it only measures Spectral Range 389 - 692 nm. the CRI90 strips produce more photons outside of that region compared to other strips, so PAR will be lower. see orange region:
by the way: how do you want to make them tunable? use 1 drivers for 2700K LED row and another for 5000K CCT row??
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