Calculating ppfd output of vero

I need to get some kind of meter myself lol the lux meter app on the phone ain't cutting it lol

At the wattages I like to play with, I needed a FLIR TG167 before the PAR meter.

Raging Stalk said:

Oh its a 2 cob hood? PPFD at 6"? If you can measure, my guess is 1800-2100.

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I just check a 3500k 80cri @ 6" with my awesome Lux meter.... 600,000 lux.

George2324 said:

Looks like I've decided on going for the vero gen 7 29 C version 3000k 90 Cri

anyone here able to help me calculate the ppfd output of these cobs when run at 1.4a each 69V One per square foot?


Cheers

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That's way overkill. If you want to run 1 per foot and can afford it, run them at 700ma. It will give you +1200 PPFD and you'll be able to maximize any particular strain with that light level. You could half the number of cobs and still achieve +1100 PPFD at 1.4 amps, still plenty of light to maximize yield. It's just with the lower ma option you get a bit more or achieve the same while dimming below 700ma. Whether that's relevant or not and worth the cost is a different matter but going to extremes with lights does have a logic to it.

I'll make sure I add a dimmer then. I want 1500 ppfd per square foot with co2.

I just want to make sure I have high enough powered drivers to achieve it. If 1400ma give some me 2000 ppfd I can always dim but if it gives me less than the desired amount I have to replace all the drivers.

In regards to dimming wires from meanwell. If a cob or led fails that is linked to the dimming wire do all Cobs go out?

I'm thinking of wiring all 27 drivers to same dimmer to make it easier to control

You always have the option of 1050ma which would still be overkill. I would think things through some more. As far as dimming, check the datasheets for dimming options and requirements.

nevergoodenuf said:

At the wattages I like to play with, I needed a FLIR TG167 before the PAR meter.

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If you don't need the fancy screen and gadgetry, local hardware stores carry handheld meters for around $35.

Definitely a good tool to have.

Rahz said:

You always have the option of 1050ma which would still be overkill. I would think things through some more. As far as dimming, check the datasheets for dimming options and requirements.

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I thought you could always dim the drivers? Surely if using meanwell driver 1400ma the dimmer can dim from 10% to 100% would be same as if using 700ma or 1050ma driver ?

George2324 said:

I thought you could always dim the drivers? Surely if using meanwell driver 1400ma the dimmer can dim from 10% to 100% would be same as if using 700ma or 1050ma driver ?

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I dim with Vero SE 29 C from 700ma on down. But I use lots of cobs to take advantage of the efficiency and performance.

Sure it is more money in up front cob costs but I saved by not using fancy drivers and heat sinks. Plus I can add more to the arrays later without increasing power draw for even more efficiency.

Citizen should come out with an all in one holder/connector like the Vero SE because these Veros are easy to deal with. Maybe next gen.

George2324 said:

I thought you could always dim the drivers? Surely if using meanwell driver 1400ma the dimmer can dim from 10% to 100% would be same as if using 700ma or 1050ma driver ?

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Sure but why? I'm all for overkill but I think of Vero29C one per foot at 700ma as serious fire power. One per foot at 1050ma you're hitting 1800 PPFD. There's no logical reason to do that, much less 1400ma. If you really want to hit 1500 PPFD 1050ma would do it, but there's a cost increase in drivers and cooling requirements and it would make very little difference if any in yield.

As far as dimming, check the driver datasheet to see the resistance values for dimming multiple drivers together.

You say 1050ma will get 1800 ppfd but is 1800 ppfd the max output of the cob or the ppfd at the canopy?

Raging Stalk said:

If you don't need the fancy screen and gadgetry, local hardware stores carry handheld meters for around $35.

Definitely a good tool to have.

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Already have it. Much better than the other.

Rahz said:

Sure but why? I'm all for overkill but I think of Vero29C one per foot at 700ma as serious fire power. One per foot at 1050ma you're hitting 1800 PPFD. There's no logical reason to do that, much less 1400ma. If you really want to hit 1500 PPFD 1050ma would do it, but there's a cost increase in drivers and cooling requirements and it would make very little difference if any in yield.

As far as dimming, check the driver datasheet to see the resistance values for dimming multiple drivers together.

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How far away from canopy?
Do you have data for Vero 29 B driven at 1050mA?

Rahz said:

Sure but why? I'm all for overkill but I think of Vero29C one per foot at 700ma as serious fire power. One per foot at 1050ma you're hitting 1800 PPFD. There's no logical reason to do that, much less 1400ma. If you really want to hit 1500 PPFD 1050ma would do it, but there's a cost increase in drivers and cooling requirements and it would make very little difference if any in yield.

As far as dimming, check the driver datasheet to see the resistance values for dimming multiple drivers together.

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He could do it just by adding in more cobs. Same total power usage, just figure out what to put in parallel.

Vero 29C 3k does get me 1500+ over a 2.5x3" with the 6 cobs spaced 4.5" apart (centers)

George2324 said:

You say 1050ma will get 1800 ppfd but is 1800 ppfd the max output of the cob or the ppfd at the canopy?

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1800 would be the photon density over the lighted space.

KonopCh said:

How far away from canopy?
Do you have data for Vero 29 B driven at 1050mA?

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PPFD calculations are irrespective of distance. The further the light from the plants the more light will hit the walls and PPFD will drop. It's a good idea to keep the array 12-16 inches above the canopy to reduce reflective losses.

I have LER (332) and QER 4.68 for the 3000/80 spectrum. The rest of what you need can be pulled from the datasheet. If you're working with a different spectrum you can still get a rough estimate with those figures, but would need to digitize the spectral curves to be exact.

Rahz said:

PPFD calculations are irrespective of distance. The further the light from the plants the more light will hit the walls and PPFD will drop. It's a good idea to keep the array 12-16 inches above the canopy to reduce reflective losses.

I have LER (332) and QER 4.68 for the 3000/80 spectrum. The rest of what you need can be pulled from the datasheet. If you're working with a different spectrum you can still get a rough estimate with those figures, but would need to digitize the spectral curves to be exact.

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I would of thought that the further away from cob the less ppfd due to light diminishing the further you go away. I plan on having cobs 12 inches away but wanted to make sure.

I'm going to be using the 90 Cri vero 29c would that still provide the same high output your talking about?


Has anyone got actual ppfd readings from these cobs?

3000K 90 CRI is what I'm planning on using.

George2324 said:

I would of thought that the further away from cob the less ppfd due to light diminishing the further you go away. I plan on having cobs 12 inches away but wanted to make sure.

I'm going to be using the 90 Cri vero 29c would that still provide the same high output your talking about?


Has anyone got actual ppfd readings from these cobs?

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Further away also means a larger coverage area at the spot reading

Rahz said:

3000K 90 CRI is what I'm planning on using.

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Underway. I have a 6 cob 80 cri, 6 90 cri and 2 4:2 80/90 cri mix batches going. Hunting for best mother plants this cycle while working out the kinks to run a proper test.

The stretch is visually noticeable with the 90 cri.

Will try and get some of the 1750k decor later, maybe they will have a 90 cri by then.