Questions regarding my COB DIY Setup 12 CXB 3590 CD bin run @ 1050ma on 2 HLG 240h-c1050b in a 4'x4'

After strenuous amounts of research I have come to the conclusion that I want to go with a DIY COB setup and the one I chose for my 4'x4'x7' Grow tent was the 12 CXB 3590 3500k running @ 1050 ma on 2 HLG 240h-c1050 drivers.

Overall Setup:
12 CXB 3590 3500k: https://www.alibaba.com/product-detail/CXB3590-CREE-CXB3590-3500K-CD-36V_60311853998.html?spm=a2700.7724838.0.0.vOVQTr&s=p (total cost = $420)

2 HLG 240h-c1050b: http://www.mouser.com/ProductDetail/Mean-Well/HLG-240H-C1050B/?qs=/ha2pyFaduh5bsFxxMyVN12Ka/I1ZmoLlWEY4TXGKUCBDXrz3/S/NQ== (total cost = ~$140)

3 5.886" Wide Extruded Aluminum Heatsink = http://www.heatsinkusa.com/5-886-wide-extruded-aluminum-heatsink/ (total cost = ~$190)

Total Cost = ~$750

Generating = 420 Watts/256 PAR Watts

Which according to my calculation would produce the same yield as a traditional 600W HPS setup. My calculations being 420 x 1.5g = 630g.

If I were to have 6 full-grown plants with a SCRoG setup in a 4'x4'x7' tent, would I be able to yield more than 2 pounds with this setup?

I got this set-up from the Growmau5 video and as he believed this was going to be the optimal setup for a 4'x4' and me being a complete novice that I should probably take his advice.

If anyone has any suggestions for me on how to a) lower the cost of my setup without lowering output, b) boost my setup to increase my yield at the same price, or c) lower the cost of my setup and boost my yield. Please let me know

Also I was wondering what your guys' opinion is on this setup by cobkits
https://cobkits.com/product/clu058-3618-active-light-engine/ (x3) = $285

https://cobkits.com/product/meanwell-hlg-320h-c/ (x2) = $105

930 cob watts
131 lm/W
120000 lm
$480

Would this setup produce more yield without sacrificing too much efficacy?

Thanks guys!

I just built a light for half my 5x9 but went a different route with it than you went here:

8- CXB 3590 (3K)
8- 140mm Pin HS
8- Cob Holders
8- Khatod Silicone Lenses
2- Mean Well 320-C2100B

I used angled aluminum to make frames and remote mounted my drivers and junction boxes. It's all wired up as one light, but each bar dims independent of the other. You could easily do this with a third bar in there as well for 12 COB's...............

Evil-Mobo said:

I just built a light for half my 5x9 but went a different route with it than you went here:

8- CXB 3590 (3K)
8- 140mm Pin HS
8- Cob Holders
8- Khatod Silicone Lenses
2- Mean Well 320-C2100B

I used angled aluminum to make frames and remote mounted my drivers and junction boxes. It's all wired up as one light, but each bar dims independent of the other. You could easily do this with a third bar in there as well for 12 COB's...............

Click to expand...

I was just wondering, what your photons:heat ratio was with that setup and how much PAR Watts you generate. Correct me if I'm wrong, with that setup you use about ~640W and generate a photon:heat ratio that is more similar to an HPS right? Or is my math completely off here?

130lm/w is pretty piss poor these days, I would be looking for over 140 and pref nearer 160lm/w cob's. If you are going to build this from scratch, vero 29's are about the best bang fer yer buck on the market currently but I cannot attest to their flowering efficacy. We use mostly luxeon 1211's gen 3 here with awesome results, they come in at or about 150lm/w for 2700-4000k and we have seen no effective difference between 90cri and 70cri so we now only use 70cri where possible as lm/w outputs are higher for 'less perfect' whites.

unbindmoney said:

I was just wondering, what your photons:heat ratio was with that setup and how much PAR Watts you generate. Correct me if I'm wrong, with that setup you use about ~640W and generate a photon:heat ratio that is more similar to an HPS right? Or is my math completely off here?

Click to expand...

I still have not bought a PAR meter so I cannot give you any hard data yet. Same with the watts at the wall as I wired in a 240V controller and can't find a damn 240V kill a watt anywhere here in the US.........

But yes my point with this light was to see if it could compete with a 1K HPS and if not how far off is it because there are benefits that would out weigh less yield (to a point). I can also add more COB's whenever I want to.

First of all if you buy from overseas your going to get hit with a few hundred in duty and tax. Just be aware of that.

Reduce cost would be to run higher Amperage drivers with less COBS.
A little more wattage but higher PPFD of around 900 is ideal.
Otherwise no real way to lower.

Your current PPFD is around 740 AVG
900 is much better.

If your trying to lower cost buy Vero 29 or Citi from @CobKits

here are some numbers comparing CXB PPFD and Par watts to Amperage of cxb and vero

4 x 4 = 16 SQ/f

CXB 3590 at 1.05A with 12 COBS = 740PPFD ,440 COB Watts ,
CXB 3590 at 1.4A with 12 COBS = 923 PPFD ( ideal) at 586 Watts
CXB 3590 at 2.1A with 9 COBS = 945 PPFD ( ideal as well) at 680 Watts

Check out the COB Calculator

If you willing to run under 900 ppfd say 700-800 you can reduce cost even further.
Check the calculator

Trippy