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Which quantum meter would you be using? Depending on the spectral response, results may be weighted towards the higher K temps if using something like Apogee MQ-200. Edit: I also vote 3000K 90CRI

Like Brother @OneHitDone said... New And Improved!

May we ask which COB Model/Kelvin Temp you decided to go with?

Photo Credits: @Greengenes707 Sorry for not asking :neutral:

Testing spread without reflective walls would be beneficial for anybody with a larger size grow. Large canopies don't have the luxury of having much/any wall reflectivity. Reflectivity will skew stand alone results. Just think larger than a tent.

Vero 18's Nominal Test Current is 1.05A with a Forward Voltage of 29.5V using about 31W each. Meanwell HLG-120H-C1050 is good up 150W so you could comfortably drive 4 chips on that driver...

I would happily disagree :D My testing space is currently occupied, but given time, I will "prove" it. Proper Spacing/Layout > Evenly Spaced Chips.

The problem is spacing multiple chips in a grid fashion. People need to get out of the mentality of spacing a COB every sq ft. People need to be working on chip layouts that reduce the differences in irradiance from 'center-to-edge' of the footprint. No special lenses or equipment necessary...

Dakini Kush nug grown under: Vero 29 3500K Same nug bottom side

https://www.hydrofarm.com/downloads/fc/mastercolor_cdm-t_elite_med_watt_350508_ffs_aen(1)_30203.pdf

Vero 29 3500K Blue Dream & Snowcap Day 14

Yes. Basically, all the other configurations are going to have a center 'hot spot' of light intensity that degrades towards the perimeter of the foot print. Spacing the chips correctly would provide extremely even coverage from this layout, keeping PPFD uniformity in mind. The idea is that...

--X--------X-- X------------X I---------------I I---------------I X------------X --X---------X-- I've been working on a design similar to this. Really trying to get as even coverage as possible.

I thought COB's didn't have any Far Red in their spectrum........ Sorry, who is in denial?? Edit: According to the charts I posted, 3000K 80 CRI has about 12-13% at the beginning of the Far Red spectrum (710nm according to wikipedia) and dwindles down to about 7% around the 740nm wavelength...

Haven't personally tried it yet, but 3000K 90 CRI looks to be the most productive spectrum on paper, IMO.

My eyes work just fine man. You are the one in denial about the graphs as I've clearly shown you don't understand them. Here is a pic from the back of the box that I'm holding right now. Not some shitty out of focus graph. Do I need to pull out the ruler?

Yep. Even less Far Red than 3000k COB. Unless you were referring to the infrared past 780nm?

Yep I did take chemistry. Did you take grade school math? Did you know that Metric and Imperial can both be converted to a percentage? A like measurement of total values? If you could comprehend the Hortilux article that you cited, you would understand that you are on both sides of the same...

:wall::wall::wall: Try pretending that instead of the COB SPD being in measured in watts (which is irrelevant to spectrum), that the peak is 100% Relative Intensity. What has changed?? Now can we compare the spectrums? Couldn't agree more. Intensity has nothing to do with the spectrum...