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That's what supra told me when I asked the same question

SupraSPL Then you have PAR W reaching the canopy. Divide that by the square footage the light is covering. Now you have PAR W/ft². Multiply that by the umol/s/W for that particular color temp (see Aleshes awesome chart) Finally, multiply that by 10.7 to convert from ft² to m² and you have...

First you find dissipation wattage which is driver current * forward voltage (see the efficiency charts thread for this info). Then you multiply dissipation W * efficiency to get PAR W emitted. The apply a reflector/lens/wall scatter penalty. 10% for lenses, 5% for COB reflectors, 20% for HID...

what would be a better option A, 4 cobs per 4.5sq.ft cab for 830ppfd ( i would need to buy 2 more cobs)or B, buy the HLG-185h-C700 driver and run 3 per 4.5sq.ft cab for 750 ppfd.(just one extra Driver) I am confused because i don't see anyone using it at such odd voltage and need expert advice

I bought a new meter and it works fine, my cxb3590 now run at 68.4v @ 560ma which is 38.3w. Originally assuming i had 700ma output I decided to put three cobs per 4.5sq.ft which would be 750ish ppfd, but now i get only 620ppfd but at 114w against 150w,

They are set to DC it's wired both my meters show correct reading while measuring 12v but when I check anything else it's wrong, a 1.5v battery shows 2.1v I checked every battery in my home. Should buy an expensive multimeter I guess. Will report back soon, what do you think about my temp tho

this is the exact driver I am using bought from same seller http://www.ebay.com/itm/Constant-Current-Driver-for-10-18x3W-High-Power-LED-AC85-265V-IP66-Waterproof-/321370032983?hash=item4ad3258b57

what am I missing used two voltmeters and same result, and ran them on a AMD cpu cooler(copper base with 4 copper pipe running along alum fins)with fan and the closest to the COB was 30c and center of COB was 62c, is this ok or Should i upgrade heatsinks ?

It gets time to get our heads around the efficiency factor and getting out of the idea of blue red leds, After mars I tried DIY blue red led it was better than Mars but yield increase per watt was minimal. Initial cost is paid with Power bills and high yield pretty soon. If you are stuck up with...

Now 2 1600w model costs $1200 and runs at 1560w. With cobs you be needing 20 cxb3590 @45 each and 5 mean well drivers @ 65 each they will be running at 50w each total 1000w. Just the cobs and drivers cost $1225 you could get the heat sinks for less than $200 and misc items $100w thermal paste...

Having experience with the Mars I would like to help you, you would need two of the 1600w models to cover your space or 8-10 of the 400w to get decent coverage.The company claim of 5x5 coverage for 1600w is just the lights reach. you would be disappointed once you hook up just one and would...