Lighting Quick question

[AnonymousGrower1]

Can four cree cxb3590 (3500k) cobs deliver a pound per square meter for a master grower?

 

[KonopCh]

Yes, if you drive them at around 100-150W.
Some hydro or coco would be also good option, instead of soil.

 

[orrganic]

Watch growmau5's yield videos on YouTube... Before YouTube deletes them.

 

[KonopCh]

Watch growmau5's yield videos on YouTube... Before YouTube deletes them.

Yea, but he uses more than 4 COBs.
CREE's are great chips, too bad they hold that price from 1-2 years ago.

 

[Tony21]

I agree, the cree 3590 is a good chip. The price of citizen 1825 chips is now the same, and can be driven to 350 w if someone has a big heatsink.
There's more bang for the buck in the citi

 

[Tony21]

Here's a seedstocker widow grown under 2 x citi 1825, going down today as it happens, way more than needed according to the quantum meter, an Apogee MQ-500, 3500 micromoles on the center cola, further down or a leaf in between, all the way down to 2-300 μmol. I think plus 400 g dry from this one

This one was harvested 2 days ago, been under 2 x cree 3590 running 65w, gave some 1100 g wet buds

It is very illuminating to have a quantum meter, unreal how quickly the PAR number decrease with distance. I'm doing some DLI measuring with the some 4 meters, 5 cm up or down makes a very big difference, but the DLI is a long time thing, and just spit measurements. Anyone talking about lumens per w is talking quacky stuff, beware.
Getting the distance right is what counts, and only a quantum meter can help with that. Not easy to get stable measurements, the slightest movement or angling of the sensor and the numbers jumps, a lot.
I understand why led sellers don't use quantum meters or don't talk about them, it's not simple

 

[orrganic]

All relevant info but my point is in the yield results of the cobs in general being displayed in regards to his question. All top brands will provide similar and decent results imo.

I have no need to promote either, I use both citizen and Vero and would happily implement others like Cree Samsung and nichia.

 

[orrganic]

Here's a seedstocker widow grown under 2 x citi 1825, going down today as it happens, way more than needed according to the quantum meter, an Apogee MQ-500, 3500 micromoles on the center cola, further down or a leaf in between, all the way down to 2-300 μmol. I think plus 400 g dry from this one View attachment 910650

This one was harvested 2 days ago, been under 2 x cree 3590 running 65w, gave some 1100 g wet buds View attachment 910651

It is very illuminating to have a quantum meter, unreal how quickly the PAR number decrease with distance. I'm doing some DLI measuring with the some 4 meters, 5 cm up or down makes a very big difference, but the DLI is a long time thing, and just spit measurements. Anyone talking about lumens per w is talking quacky stuff, beware.
Getting the distance right is what counts, and only a quantum meter can help with that. Not easy to get stable measurements, the slightest movement or angling of the sensor and the numbers jumps, a lot.
I understand why led sellers down use quantum meters or don't talk about them, it's not simple

Shit hot info mate, I would love your opinion @KonopCh too on ideal hanging distance for x4 Vero 29 @ 90w...

 

[KonopCh]

Get a LUX meter for 10€, if you're using 3000K 80CRI Veros, divide by 69. That's your umol/s.
278 umol/s is 1 DLI.
Get around 25-35 DLI. The higher, the more difficult is to maintain proper health of plants. But 25-30 DLI can handle like easy cake. At least mine.

 

[Journey Man]

The light meter you have @Tony21 what is it good for? So you can know how far away you gonna keep your plants ? How much does it cost, i definitely wish i had one of those.