New light or????

Olive Drab Green

Olive Drab Green

Well-Known Member
It looks like the guy is growing short plants in a SoG. It’s not really penetrating, because there’s nothing to penetrate. I really doubt F strips would be better than COBs watt for watt. Do you have PPFD readings? Any data comparing the two? Have you ever even run COBs?
 
Olive Drab Green

Olive Drab Green

Well-Known Member
How many GPW did you say the F series yields? I got this for you, for reference.

“If someone can't pull at least 1.4 - 1.5 GPW using current cob technology they don't know what they are doing. I have a lamp using Vero 29 version 1 running at 40% efficiency, about 125 LPW. 3500K 80 CRI. The minimum I have pulled from it is 1.35 GPW and the best has been 1.68 GPW. That's 21 ounces from a 350w output lamp in 10 square feet, almost 60 g/ft. That doesn't include several Os of lower branch popcorn.

I have another lamp, my first one, using Vero v1 at nominal current. That's about 36% efficiency, 115 LPW in theory except for the fact that the Tj ran hot, about 65C, and it consistently achieved 1.25 GPW. 80 CRI, Kelvin averaging out to 3350.”

Edit: Nevermind, you guys said 180 LPW. This dude’s Gen 1 Vero29 put out 125 LPW at 40% efficiency in 2016. I have Gen 7 Vero29Cs. I also run it full power, and lumens are irrelevant anyway, because lumens and lux are relative to visible light, not usable photons.
 
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Randomblame

Randomblame

Well-Known Member
Olive Drab Green said:
It looks like the guy is growing short plants in a SoG.J
It’s not really penetrating, because there’s nothing to penetrate. I really doubt F strips would be better than COBs watt for watt. Do you have PPFD readings? Any data comparing the two? Have you ever even run COBs?
Click to expand...

You have not even read a bit. He has 8 plants in cocos, 4ft. tall, not defoliated ..

https://www.rollitup.org/t/strip-leds-in-the-garden-of-paradise.954799/page-14#post-14058522

I've have made and used a few COB based lights and I'm currently building a new strip based light.
No PPDF readings yet, but these are the numbers for the used diodes on F-strips/QB's:

LM561C - A1/S6 - 3000K @65mA
VF: 2.9V (max)
Flux: 34.5 lm (min)
QER: 321.6 lm/W
LER: 4.86 µmol/J
-> 2.766 µmol/J

The lamp below has 4 CXB3590/CD/3500°K running at 1050mA + 12 Osram Oslon hyperred @ 700mA, about 2.2μmol/J, 185w from the wall. I had two of them that I sold and before you ask, I got $ 300 each.
 

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Olive Drab Green

Olive Drab Green

Well-Known Member
Randomblame said:
You have not even read a bit. He has 8 plants in cocos, 4ft. tall, not defoliated ..

I've have made and used a few COB based lights and I'm currently building a new strip based light.
No PPDF readings yet, but these are the numbers for the used diodes on F-strips/QB's:

LM561C - A1/S6 - 3000K @65mA
VF: 2.9V (max)
Flux: 34.5 lm (min)
QER: 321.6 lm/W
LER: 4.86 µmol/J
-> 2.766 µmol/J

The lamp below has 4 CXB3590/CD/3500°K running at 1050mA + 12 Osram Oslon hyperred @ 700mA, about 2.2μmol/J, 185w from the wall. I had two of them that I sold and before you ask, I got $ 300 each.
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I’m not saying they aren’t useful. Like I said, I want to look into them. But I think you’re either biased or misinformed about the strips being better than COBs. No offense, but I’d like to see a PPFD reading if possible. Lumens are irrelevant.

You’re underdriving your COBs, aren’t you? I run mine at like, 1670, 1400, and 2150mA, depending on which build.
 
wietefras

wietefras

Well-Known Member
Olive Drab Green said:
People have been switching away from panel LEDs to COBs because the varied light sources couldn’t penetrate for shit. Like I said, it’s why you have to stack strips: better concentration for better intensity.
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That's just some nonsensical myth.

Light penetration is the depth at which the light intensity dropped of too much to still facilitate proper growth/flowering. There are two things which determine this:
1) Initial light intensity (the more light you start with the deeper it will go before the intensity drops off too much)
2) Whether the light is direct (from few or a single point of light) or diffuse (in our case if it's coming from one or multiple light points)

Ad 1) Of course it matters if you start with 800umol/s/m2 on top or only 400umol/s/m2. In the second case you will probably have half the "penetration". For light intensity, it does not matter if you get this light from one 1000W light point or 1000 1W light sources.

Ad 2) Direct light will be blocked much quicker than diffuse spread out light. When I first switched out my HPS with a COB fixture, there was a ton of light falling through the leaves while with HPS it was quite dark below the canopy. The things is that if you have one point of light, the leaves all orient themselves to that light source and form a closed canopy. Very little light passes through. When you have multiple light sources the leaves orient themselves towards the closest light point. The surrounding light points can still send their light under the leaves.
 
Olive Drab Green

Olive Drab Green

Well-Known Member
nxsov180db said:
No, I am going to talk about ppfd and try to compare 200 watts of led to 600 watts of hps because I'm a fucking retard. Then when someone says you can't really compare 200 watts of led to 600 watts of hps im going to say, "but ppfd" and make myself look like an even bigger dummy.
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I said that 200w of COB could cover half a square meter in the PPFD of a 600w HPS in a full square meter, which is true. A 600w HPS puts about 900-1200 PPFD in a square meter. I can put that PPFD in half a square meter, which is my grow space.

Meanwhile, you follow me around trying to suck my dick and make yourself look stupid.
 
Olive Drab Green

Olive Drab Green

Well-Known Member
nxsov180db said:
You should go back to the thread you started and acknowledge the post that cobkits made about your ppfd comparison, he made you look like a little school girl but you never responded like the fucking coward that you are.
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He actually confirmed that I was technically right. It was all relative, but I even quoted what he said back to him.
 
Randomblame

Randomblame

Well-Known Member
Oh no! It is a pity that any conversation is complemented by offensive phrases just because someone else has a different opinion.
Look!
When it comes to penetration, multiple COBs work better than a single HPS because they are multiple, weaker light sources, but spread the light better, right?
Then strips must penetrate even better than COB's for exactly the same reason.
I do not know anybody who jumped from stripes or QB's back to COB's.
You mix too much half-knowledge and conviction into your answers, instead of looking at the whole thing logically.
Have you already googled the benefits of diffused light in greenhouses? Mmmm! I do not think so...
 
Olive Drab Green

Olive Drab Green

Well-Known Member
nxsov180db said:
Using your own logic (even if its not valid) against you makes me look like I am crying? Something tells me your IQ of 149 is off, by possibly 100 points.
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Except it’s not. And nothing you can say can alter reality to make it otherwise, try as you might. Sorry, baby girl.
 
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