Water cooled COB Build/pic heavy

qballizhere said:
For me the decision was easy I have 96 sq feet of flowering canopy and if i choose the 1212 I would need 71 of the 1212 cobs @1.4A to equal 48 of the 1818 @ 1.4A
so 1212= $923
1818=$1056
Ok $125 difference so far
Drivers I wanted built in software dimming. so that leaves you with the elg drivers right now. Soon the hlg will be available with built in software dimming.
so 1212 uses 36v I would do elg-240-36-d2 you would need approx 18 drivers drivers but the best efficiency is below 50W max amperage is 2.7A
The 1818 uses 54v and need 16 drivers best efficiency is below 150w max amperage is 4.1A
so the difference would be $25 paying $50 a driver. for me it would come down to less drilling and screwing in heat sinks mounting cobs and wiring. With the driver I listed it puts out 4.45A so its easy math figuring out how many per driver yes its wired in parallel so if you lose a cob the other 2 are still fine. this is the main reason I switched from 2.1A to 1.4A by just adding 3 cobs per driver instead of 2 I didnt want anything to happen if a cob went down and it got the full 4.45A would it still run sure but I didnt want to run at full power
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What color and cri are you running on those 1818's? Any opinions or comparisons on those versus hps or other cobs?
 
Godfather420 said:
So I guess I'm kinda going at this backwards then. I started with what layout I want 3x3 cob. Then I broke down the power from the wall I wanted use. Max 650w. Then i tried to make it as efficient and moderately priced from the calculators.

When you say that you would need 71 of the 1212 vs 48 to equal the same 1818's, in what measurement are you referring
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This is what I was referring to using my area and the 2 different cobs The number I am looking at is PPFD


Citizen.1212C4.3000K 71 COBS @1.4A ON 5.88 PROFILE HEATSINK
96 SQ.FT. CANOPY 93% EFFICIENT DRIVER @10 CENTS PER KWH
Total power watts at the wall: 3858.06
Cobs power watts: 3588
Total voltage forward: 2563
Total lumens: 523848
Total PAR watts assuming 10% loss: 1437
Total PPF: 6983.82
PPFD based on canopy area: 783.05 <<<<<<This number here
PAR watts per sq.ft.: 14.97
Cob efficiency: 44.51%
Power watts per sq.ft.: 37.38
Voltage forward per cob: 36.1
Lumens per watt: 146.0
Heatsink riser thickness / number of fins / fin's length: 0.27in/14/1.0in
Heatsink area per inch: 260.01 cm^2
Total heat watts: 1991
umol/s/W / CRI: 4.86 / 80CRI
Heatsink length passive cooling @120cm^2/heatwatt: 919 inches
Heatsink length active cooling @40cm^2/heatwatt: 306 inches
COB cost dollar per PAR watt: $0.62
Electric cost @12/12 in 30 days: $139.39
Electric cost @18/6 in 30 days: $208.84
Cost per cob: $12.55
Heatsink cost per inch cut: $1.74
Total cobs cost: $891
Total heatsink passive cooling cost: $1599
Total heatsink active cooling cost: $532
Citizen.1818C4.3000K 48 COBS @1.4A ON 5.88 PROFILE HEATSINK
96 SQ.FT. CANOPY 93% EFFICIENT DRIVER @10 CENTS PER KWH
Total power watts at the wall: 3756.99
Cobs power watts: 3494
Total voltage forward: 2496
Total lumens: 520606
Total PAR watts assuming 10% loss: 1430
Total PPF: 6949.8
PPFD based on canopy area: 779.24 <<<<<<< here a few points difference less than 4ppfd
PAR watts per sq.ft.: 14.9
Cob efficiency: 45.48%
Power watts per sq.ft.: 36.4
Voltage forward per cob: 52.0
Lumens per watt: 149.0
Heatsink riser thickness / number of fins / fin's length: 0.27in/14/1.0in
Heatsink area per inch: 260.01 cm^2
Total heat watts: 1905
umol/s/W / CRI: 4.86 / 80CRI
Heatsink length passive cooling @120cm^2/heatwatt: 879 inches
Heatsink length active cooling @40cm^2/heatwatt: 293 inches
COB cost dollar per PAR watt: $1.08
Electric cost @12/12 in 30 days: $135.75
Electric cost @18/6 in 30 days: $203.38
Cost per cob: $32.08
Heatsink cost per inch cut: $1.74
Total cobs cost: $1540
Total heatsink passive cooling cost: $1529
Total heatsink active cooling cost: $509
 
qballizhere said:
Kingbright is $22 each but they are going on holidays until feb 6th and @CobKits may work something out for you depends how many you are getting at once.
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I was working with vicky at Kingbright and I couldn't get her to budge below 24.50...Digikey has em cheaper....same thing on the power supplies she wanted 3 buck more and i still had to pay freight

CobKits said:
ive got the best selection. you may or may not save a buck or two if you order from china
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I was trying to work with you, but you seemed to be quite busy the last few days and confused me for someone else... then just fell off............
 
Godfather420 said:
Ok so next question..Who's got the best deals on citizen chips?
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I am here stalking you too! I would really like to do a water cooled setup some day; it makes sense (all nay Sayers aside)!

I think CDI has the best prices but check cobkits.com as well. I got my 1212's last summer for less than $11/cob ( in quantity, I bought 72).
 
Organic Miner said:
I am here stalking you too! I would really like to do a water cooled setup some day; it makes sense (all nay Sayers aside)!

I think CDI has the best prices but check cobkits.com as well. I got my 1212's last summer for less than $11/cob ( in quantity, I bought 72).
Click to expand...

Good looking Organic! How are the 1212's treating you? Color and CRI please?
 
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