DIY 4x12 3500K/5000k lm561c two channel board

wietefras

wietefras

Well-Known Member
Nice try, but you already stated that you don't have a PAR meter.

Guestimating a single PPFD measurement with a lux meter really is an utterly useless comparison. Especially since the color and and the covered area is quite different too.
 
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amyg88

Well-Known Member
wietefras said:
The problem here is that you don't understand what the word "optimum" means. First of all you probably mean "optimal" since there is no single optimum. An optimal value is a "local optimum" optimized to match a certain set of conditions.

So then this set of conditions needs to be noted for such a term to be meaningful at all. For one person optimal could mean as high an efficiency as possible. Yet for someone else who pays only a few cents per kWh looking for an economically optimal current to use as few SMDs possible for the amount of light needed.

In this case you clearly pulled that "optimal" value from ... well ... somewhere dark
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So if we consider the average cost per kWh in the USA, what current would you run them at?
 
wietefras

wietefras

Well-Known Member
I run COBs and SMDs between 45% to 50% efficiency, but it keeps going up as COBs/SMDs get more efficient and their price drops. Not sure how that matters though. There still is no "optimum" and an "optimal" value is only valid for certain groups. Prices in the US vary between $.09 per kWh and $.36.

Anyway, the point is, he's just trying to sound scientific in establishing "proof" without actually providing evidence. There could be s5 bin SMDs for all you know. Again, that's at the buyers risk, but he went around pretending that people should go for well over 50% because he thinks his boards do so too. So then I point out that he's in fact not doing what he preaches.
 
StonerCol

StonerCol

Well-Known Member
VegasWinner said:
nothing remains the same.
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Except for the petty bickering. And some peoples' assertion that some of us reasonably intelligent adults need protecting from the big bad DIY/Co-op'er who isn't trying to make a profit and whose boards are being used by people who are perfectly happy with the results thus far, and the price they paid for that product.
Oh and chasing people around a whole forum just to continue said petty bickering. So yeah, some things unfortunately do remain the same.....

:peace: (:

P.S. What is the shipping cost to the UK for a board please?
 
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amyg88

Well-Known Member
wietefras said:
I run COBs and SMDs between 45% to 50% efficiency, but it keeps going up as COBs/SMDs get more efficient and their price drops. Not sure how that matters though. There still is no "optimum" and an "optimal" value is only valid for certain groups. Prices in the US vary between $.09 per kWh and $.36.

Anyway, the point is, he's just trying to sound scientific in establishing "proof" without actually providing evidence. There could be s5 bin SMDs for all you know. Again, that's at the buyers risk, but he went around pretending that people should go for well over 50% because he thinks his boards do so too. So then I point out that he's in fact not doing what he preaches.
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Ignoring the outliers, most are ~10c, like Nevada (i don't live in the US)

If you were VW, what current would you use?

Not trolling, just interested.
 
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VegasWinner

Well-Known Member
StonerCol said:
Except for the petty bickering. And some peoples' assertion that some of us reasonably intelligent adults need protecting from the big bad DIY/Co-op'er who isn't trying to make a profit and whose boards are being used by people who are perfectly happy with the results thus far, and the price they paid for that product.
Oh and chasing people around a whole forum just to continue said petty bickering. So yeah, some things unfortunately do remain the same.....

:peace: (:

P.S. What is the shipping cost to the UK for a board please?
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International USPS First Class no tracking $22 number of boards does not matter same price US $20 USPS with tracking
 
StonerCol

StonerCol

Well-Known Member
VegasWinner said:
International USPS First Class no tracking $22 number of boards does not matter same price US $20 USPS with tracking
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That sounds very reasonable :)
I have an idea in mind....I'm going to get another member here to build me a COB or 2. I'm thinking of incorporating 1 of these boards into a rig with a couple of those COBs. I only have a small space and only need approx. 320W but I like the idea of using different technologies in the same light.
Does this sound like a reasonable idea?
 
Moflow

Moflow

Well-Known Member
StonerCol said:
That sounds very reasonable :)
I have an idea in mind....I'm going to get another member here to build me a COB or 2. I'm thinking of incorporating 1 of these boards into a rig with a couple of those COBs. I only have a small space and only need approx. 320W but I like the idea of using different technologies in the same light.
Does this sound like a reasonable idea?
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Why not?
I've ran a qb and cobs no problem.
The growgreen board will probably need it's own dedicated driver though.
The 2 x growgreen boards I have are running at 100 watts each for a nice spread over
32 inch x 32 inch area.
The plants are growing just the same as a qb at 100w and 2 x cxbs at 50w apiece in same area.
:cool:
 
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VegasWinner

Well-Known Member
StonerCol said:
That sounds very reasonable :)
I have an idea in mind....I'm going to get another member here to build me a COB or 2. I'm thinking of incorporating 1 of these boards into a rig with a couple of those COBs. I only have a small space and only need approx. 320W but I like the idea of using different technologies in the same light.
Does this sound like a reasonable idea?
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Absolutely
 
wietefras

wietefras

Well-Known Member
amyg88 said:
Ignoring the outliers, most are ~10c, like Nevada (i don't live in the US)

If you were VW, what current would you use?

Not trolling, just interested.
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Well I pay 23ct, so for only 10ct I would run them a lot harder than I do now.

The data on these boards isn't comprehensive enough to any proper calculations, but I have a calculation model for Cree and Citizen COBs. At 10ct per kWh then it would be cheapest over a 2 year period to run them at 46% efficiency. For 23ct it's 50% and at 36ct per kWh it would be 52%.

Maybe a few percent doesn't sound like a lot of spread, but to get from 46% to 52% efficiency means almost doubling the number of leds. So there really is quite a spread and it's most certainly not just one figure which is "optimum". Everybody will have their own optimal efficiency.
 
Growcob5

Growcob5

Active Member
VegasWinner said:
I was looking at a YT video by LEDGardner.

He is reviewing a QB 288 2 board 240H-C2100B driver at 260w. At 24" he was measuring 500 PPFD . I measured ONE 200w GrowGreen board with a 185H-C1050A driver and measured at 24" , the one I just uploaded a picture of, at the same 24" center I measured 430 PPFD.

Two QB288 boards are 260w and one GrowGreen board is 200w, and only 70 PPFD between them and the cost priceless.
namaste
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No shit. Love to see how ur plants doing budy. Lmk if u do not mind. Or any others that got that cool borad lmk
 
Growcob5

Growcob5

Active Member
VegasWinner said:
I was looking at a YT video by LEDGardner.

He is reviewing a QB 288 2 board 240H-C2100B driver at 260w. At 24" he was measuring 500 PPFD . I measured ONE 200w GrowGreen board with a 185H-C1050A driver and measured at 24" , the one I just uploaded a picture of, at the same 24" center I measured 430 PPFD.

Two QB288 boards are 260w and one GrowGreen board is 200w, and only 70 PPFD between them and the cost priceless.
namaste
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unknown number from row it up said that you sing reflectors on any Cobb or bored your going to lose photosynthesis radiation from the light you're going to lose. Idk if it is correct because from what I've seen from the video that I watch the one Led Gardner white month ago that you had listed his measurements pad increase all the way around when adding the reflector
 
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VegasWinner

Well-Known Member
Growcob5 said:
unknown number from row it up said that you sing reflectors on any Cobb or bored your going to lose photosynthesis radiation from the light you're going to lose. Idk if it is correct because from what I've seen from the video that I watch the one Led Gardner white month ago that you had listed his measurements pad increase all the way around when adding the reflector
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The reflector created a hot spot in the center. I was using the video to show one GrowGreen board with a 1050 driver is as good as two QB288 boards with a 2100 driver. Half as many boards 384 diodes driven by a hlg-185h-c1050b as good as 576 diodes driven by a hlg-320h-2800b driver. GrowGreen more efficient lower amps higher lumens watts and ppfd
 
Growcob5

Growcob5

Active Member
I seen that i was. In all so how's efficiency with them or voltage that has to be given to this board does the efficiency go down I'm just asking I'm not sure I don't know. Cuz it needbmore volts. Than say 30 otlr 40volts
 
ttystikk

ttystikk

Well-Known Member
VegasWinner said:
The reflector created a hot spot in the center. I was using the video to show one GrowGreen board with a 1050 driver is as good as two QB288 boards with a 2100 driver. Half as many boards 384 diodes driven by a hlg-185h-c1050b as good as 576 diodes driven by a hlg-320h-2800b driver. GrowGreen more efficient lower amps higher lumens watts and ppfd
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Let's see your sphere and gonio testing numbers before making claims like those.

I think you're doing good work but let's not fall into the hype trap.
 
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