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I use a combination of bare COBs in the center of the canopy and reflectorized COBs on the edge of the canopy. I suspect that if I used short reflectors in the center I could improve gpw. I do believe reflector losses will be lower than wall losses because the reflector has more opportunities...

Not sure exactly which device he used but maybe he can fill us in @welight Some of the methodology is here (Cree 5700K test)

You can adjust for a tall canopy by increasing PPFD. So you could: increase current or run them even lower (350mA) and pack them in tighter. You could also use higher angle lenses or reflectors. I run mine at 500-700mA, no lenses on the center COBs and the ladies are as tall as 5.5 feet tall at...

I come up with 811 PPFD averaged for 6 sq ft. Yes that should treat you very well in you 2X3. Good luck!

Thanks to Mark we were able to compare the SPD and output of the 3000 80CRi 3500 80CRi and 4000K 70CRi. Butwe will have to work on getting the SPD for the 4000K 80 CRi CD bin. Once we have that, @alesh might be able to extract the LER and QER, then Apogee should be able to get us the correction...

One major threat to a COB is intermittent power from a high voltage constant current driver because it can kill a COB instantly (over voltage). Because of this all wires have to be 100% secure during testing, especially if there is a single COB on a high voltage driver. Since your HLG-185H-C500...

I have also had good results from the 4000K 80 CRi CD in flower, but have not tried the 4000K 70 CRi DB. In veg, I have had good results from the 5000K 70 CRi CD and recently the 5000K 80 CRi CD became available. I expect the 4000K 70 CRi DB would be an even better veg light than the 5000K CD...

In Mark's test the 3000K = 3044K, the 3500K = 3375K and the 4000K 70 CRi = 3784K. The 4000K has the highest photon count and it has the least of its output above 700nm (where photosynthetic efficiency is known to drop off quite a bit). The 3500K has only slightly more output above 700nm, but not...

@mduke pointed out that Cutter (THANK YOU Mark @welight ) posted the SPDs (based on photon count) for some of the most popular CXBs and it takes the bin into account, the 3000K 80CRi CB, 3500K 80CRi CD and 4000K 70CRi DB. I tried to adjust them to be relative to each other in this gif

I guess the most useful way to use the PAR meter for those tests would be to make a map without walls and another inside the tent. Nice, Euroaquatics Angel is actually owned by Gavita, I guess I should have searched harder. Maybe they will develop an LED grow lamp at some point (or buy one)...

Corey from Black Dog LED (Colorado) was interviewed on the Adam Dunn Show, seems like he has some decent knowledge but that does not seem to be reflected in the product IMO. I would be willing to bet he will jump on the COB bandwagon at some point. LED talk starts around 1:25:30

Yep Blackdog goes right in the pile with the rest of the generics. When it comes to generic LEDs, assume the worst and you will have a pretty good idea of its value. http://growershouse.com/blog/black-dog-platinum-xl-u-750w-led-grow-light-unboxing-review-par-test/

Sativied, you seem to know a lot about Gavita so maybe you can answer this. Do you think they will jump with excitement to experiment with a lighting technology capable of game changing efficacy, or will they stubbornly resist it and be one of the last to develop LED based grow lamps?