Need Opinions on my Final Setup (no replies on the other thread in General D:)

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unbindmoney

Active Member
Hey guys, So after a good amount of research I have decided on this DIY COB setup that will generate 571.2W with a 65:35 (Photons:Heat Ratio). I am using a 4'x4'x7' iPyarmid Grow Tent and actually still have some questions on ventilation. But here is what I have in mind for my light setup (which I think was the hardest part in my learning).


HLG-120H-C700B x 4 = $188

http://www.mouser.com/ProductDetail/Mean-Well/HLG-120H-C700B/?qs=sGAEpiMZZMt5PRBMPTWcafxiK6L3g9qC7xyXHlSeLXI=

One of these drivers will generate 700 ma and 107-215V and I plan to power 6 34V COBs (@700mA) in them.

Citizen1212 CLU048-1212 80CRI 3500k x24 = $318

https://cobkits.com/product/citizen-clu048-1212-80cri-choice-of-color-temps/

Heatsinkusa 44"x3.5" x4 = $203

http://www.heatsinkusa.com/3-500-wide-extruded-aluminum-heatsink/

I did the calculation on these since my 6 COB setup in my ELG-150-C700B will generate 142.8W and with a photon:heat ratio of 65:35, I will generate 49.98 Heat Watts and as a passive heatsink needs 17 inch square per Heat Watt (49.98 x 17 = ~850 inch square). The 3.5" Heatsink from HUSA cools per 19.60 square inch (according to https://www.rollitup.org/t/heatsinks-for-diy-led-lamps.851907/) 19.60 x 44 = 862 inch square, more than enough to cover the ~850 inch square I need. I also think the 44" will have a nice spread in my 48"x48" tent.

I will wire my cobs in a Series with one driver supporting 6 COBs and one Heatsink. So in case one row malfunctions I will have an additional 3 rows for safety.

Two questions: 1) How do you guys think I can align my 4 rows in a neat fashion inside my 48"x48" tent. 2) I originally planned on using Cree CXB3590s but the costs of the Citizens really appealed to me and after reading that it runs optimally below 50W and as I am using a 700ma Driver that will generate 23.8W per COB, I think it's a perfect match.) I guess the question is how much of a drop-off is it from the CXB3590s?

Total Cost: ~$689 (before taxes/shipping)

Can say I've learned a shit ton from you guys over the past week, thanks!
 
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CobKits

CobKits

Well-Known Member
a citizen 1212 @ 24W is about as efficient as a 3590 @40watts
2 citizen 1212s at a total of 48W are as efficient as a 3590 @40watts (and still cheaper and higher total output)
 
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unbindmoney

Active Member
CobKits said:
a citizen 1212 @ 24W is about as efficient as a 3590 @40watts
2 citizen 1212s at a total of 48W are as efficient as a 3590 @40watts (and still cheaper and higher total output)
Click to expand...
Thanks for the info! If my first grow is successful I plan on upgrading space and getting more COBs, driver, and heatsink.
 
CobKits

CobKits

Well-Known Member
that heatsink is a little short for passive. maybe throw a single fan on each one, or you can upgrade to 3.94, 4.6, or 4.9" profiles and it would be well under the 4' required to fit in your tent

per 6-cob bar:

Total voltage forward: 204.22
Total lumens: 24122.97
Total PAR watts assuming 10% loss: 64.81
Total PPF: 346.36
PPFD based on canopy area: 699.48
PAR watts per sq.ft.: 12.16
Cob efficiency: 50.37%
Power watts per sq.ft.: 26.82
Voltage forward per cob: 34.04
Lumens per watt: 168.75
Heatsink riser thickness / number of fins / fin's length: 0.3in/8/0.75in
Heatsink area per inch: 126.42 cm^2
Total heat watts: 71.48
umol/s/W: 2.42 LER: 335.00 QER: 4.81
Heatsink length passive cooling @120cm^2/heatwatt: 68 inches
Heatsink length active cooling @40cm^2/heatwatt: 23 inches
COB cost dollar per PAR watt: $1.11
Electric cost @12/12 in 30 days: $5.36
Electric cost @18/6 in 30 days: $8.04
Cost per cob: $12.0
Heatsink cost per inch cut: $1.15
Total cobs cost: $72.0
Total heatsink passive cooling cost: $78.20
Total heatsink active cooling cost: $26.45
 
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unbindmoney

Active Member
CobKits said:
with that many cobs id go with (2) hlg-320-36b or (1)hlg600-36b, both 95% efficient
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I'm confused since the Output Voltage and Amperage seem a bit off from what I'm used to seeing, So for the HLG-320-36B the output is 36V with a 8.9 A. Wouldn't the 36V only be enough to power 1 COB and wouldn't 8.9 A blow up my COB?

Also would (4) HLG 120h-700b work for a 6 COB set-up at 65% COB efficiency?
 
CobKits

CobKits

Well-Known Member
unbindmoney said:
I'm confused since the Output Voltage and Amperage seem a bit off from what I'm used to seeing, So for the HLG-320-36B the output is 36V with a 8.9 A. Wouldn't the 36V only be enough to power 1 COB and wouldn't 8.9 A blow up my COB?
Click to expand...
those run in parallel, so 12 cobs would get 8.9A/12 = 741 mA each

unbindmoney said:
would (4) HLG 120h-700b work for a 6 COB set-up at 65% COB efficiency?
Click to expand...
sure would it work but it wouldnt be 65% efficient, not sure where that number is coming from
 
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unbindmoney

Active Member
CobKits said:
those run in parallel, so 12 cobs would get 8.9A/12 = 741 mA each


sure would it work but it wouldnt be 65% efficient, not sure where that number is coming from
Click to expand...
As in I would have to rely on parallel wiring? And what I meant by 65% efficient is since a 700 mA/215V output Driver will run 6 COBs @ 65:35 (photons:heat ratio) and generate ~143W or am I doing the math incorrectly?
 
CobKits

CobKits

Well-Known Member
unbindmoney said:
And what I meant by 65% efficient is since a 700 mA/215V output Driver will run 6 COBs @ 65:35 (photons:heat ratio)
Click to expand...

thats what i dont understand, what is the basis for that assumption? the 1212s would be approaching 60% at the chip level at 700 mA. minus driver and potential optics losses, mid 50s overall (not bad, but certainly not 65%. youd want to run the cobs at 5-10W ea to get that
 
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unbindmoney

Active Member
CobKits said:
thats what i dont understand, what is the basis for that assumption? the 1212s would be approaching 60% at the chip level at 700 mA. minus driver and potential optics losses, mid 50s overall (not bad, but certainly not 65%. youd want to run the cobs at 5-10W ea to get that
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Here is how I did my math. Basing off Growmau5 videos (he uses CXB3590s)

Using Ohm's Law = (FV) x (i)

1212's running @ 700mA = 34.04FV x 0.7 = 23.828W

With 6 COBs wouldn't it be 23.828W x 6 = 142.968W (~143W)


And if I'm not misinterpreting him, Growmau5 said with a 700 mA driver setup, although you need to buy more COBs it raises your efficiency to a 65:35 (photons:heat ratio)

Video link:
 
CobKits

CobKits

Well-Known Member
unbindmoney said:
And if I'm not misinterpreting him, Growmau5 said with a 700 mA driver setup, although you need to buy more COBs it raises your efficiency to a 65:35 (photons:heat ratio)
Click to expand...
with CXB3590.. and it turns out that is probably slightly optimistic in retrospect
 
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unbindmoney

Active Member
CobKits said:
with CXB3590.. and it turns out that is probably slightly optimistic in retrospect
Click to expand...
So what you're telling me is HLG 320-36b will be 95% efficient in regards to photons:heat ratio, if so how much grams can i expect per Watt? Would I be able to pull around 1.75g per 1 Watt?


Edit: I do not want to run a parallel wiring setup. With the 4 HLG 120h-700b setup how much photons:heat ratio would I be pulling? Would it be around 60:40 or 55:45?
 
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CobKits

CobKits

Well-Known Member
unbindmoney said:
So what you're telling me is HLG 320-36b will be 95% efficient in regards to photons:heat ratio,
Click to expand...
driver electrical efficiency is electrical power out/electrical powered in, and doesnt really relate to photons as drivers dont produce light

unbindmoney said:
how much grams can i expect per Watt? Would I be able to pull around 1.75g per 1 Watt?
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not a question i can answer as light is only one small part of the entire equation

light, environment, water,nutes, canopy management, genetics, grower skill, etc.

unbindmoney said:
Edit: A HLG 320-36B running 12 COBs @ 741 mA would generate 302.68368 W (0.741 x 34.04). Being 95% efficient, how much heat % would it generate in regards to photons:heat ratio? Trying to figure out heat sink calculations and it seems that 15.13 Heat Watts (0.05 x 302.68) doesn't seem accurate
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forget about your driver entirely for heat sink calcs, it is irrelevant

just use 60% efficient for a chip
each chip = 24W -> 14W of light and 10W of heat to dissipate

unbindmoney said:
Edit 2: I do not want to run a parallel wiring setup so if you can provide me an alternative in series wiring that'd be great
Click to expand...
hlg-150h-c700b
hlg-185h-c700b
hlg-240h-c700b
hlg-320h-c700b

unbindmoney said:
With the 4 HLG 120h-700b setup how much photons:heat ratio would I be pulling? Would it be around 60:40 or 55:45?
Click to expand...
~55:45 considering driver losses which is excellent
 
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CobKits

CobKits

Well-Known Member
download the citi calculator in bggrass's signature you can play around with currents and heatsinks and see all your options
 
U

unbindmoney

Active Member
Hey, was tinkering with the calculator you linked me and basically here is what I came up with.

HLG-240H-C1400B (x3)

CXB3590 DD 36V, 5000k (x12)

HUSA Heat Sink 4.230” x 46”

This setup according to the calculator will run the COBs at ~65% efficiency

And according to the calculator it will generate 207.45W per Driver

207.45W x 3 = 622.35 Total Watt with a 65% COB efficiency.

What do you think? I'm not sure how to export the stats but here is basically what I entered in the calculator:
Select COB type: CXB3590DD36v5000k
Enter # of COBS: 4
Select Amperage: 1.4mA
Select Heat Sink: 4.23
Enter Canopy Area: 16 sq. ft.
Enter Driver Efficiency: 94
Electric Cost: 23 (not sure what my local area cost actually is)
 
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