Water cooled COB Build/pic heavy

Godfather420

Godfather420

Well-Known Member
CobKits said:
ill loan a li-cor

nothing needs water cooling lolol
Click to expand...
Hmmmmmm.....Actually yes, lots of things need water-cooling... in fact. how much water did you just drink while shoveling that snow off you driveway? Yes, watercooling.... And how bout that car you're digging out of the snow? Unless its a VW or porsche, most likely it's water cooled as well... ; )
 
Godfather420

Godfather420

Well-Known Member
Water cooling for me, like you ain't so much about cooling these chips. It about efficient heat and dehumidification removal as well. And furthermore, on the gorilla tip, keeping those peeps in places where its still illegal, armed with the best to tech to defeat the man! No infrared scan will pick up my future water-cooled grow. But water-cooling will always be more expensive upfront.These things cost money to establish.
 
Godfather420

Godfather420

Well-Known Member
ttystikk said:
Very impressive work, lots of sexy machined bits!

My water cooled modules are made from 2"x4"x3/16" thick aluminum bar stock, nothing custom about it. Then cut 2" L brackets into 4" lengths and welded them to the ends, tapped for 1/2" NPT and done. All the electronics go on the outside. Each module has 4 chips at 54W each.

With this approach, I was able to minimize cost across a sizeable array.
Click to expand...
So what cobs you running? If i remember correctly it was 3590's ?
 
ttystikk

ttystikk

Well-Known Member
Godfather420 said:
So what cobs you running? If i remember correctly it was 3590's ?
Click to expand...
Cree CXB3590 3500K 80 CRI CD bin 72V, four to a Meanwell HLG-185H-C700B driver with the dimming leads capped so it pulls 8% over max, for a total of 54W per chip x 4 chips = 216W, driver adds the difference to get a Kill-a-Watt verified 225W from the wall. King Brite glass 80 degree lenses round out the optics package.
 
qballizhere

qballizhere

Well-Known Member
Godfather420 said:
or maybe the cxb's....... and then there are the cheap 1212's what will i ever do.
Click to expand...
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
 
Godfather420

Godfather420

Well-Known Member
ttystikk said:
Cree CXB3590 3500K 80 CRI CD bin 72V, four to a Meanwell HLG-185H-C700B driver with the dimming leads capped so it pulls 8% over max, for a total of 54W per chip x 4 chips = 216W, driver adds the difference to get a Kill-a-Watt verified 225W from the wall. King Brite glass 80 degree lenses round out the optics package.
Click to expand...
Nice use of space on that driver.
 
Godfather420

Godfather420

Well-Known Member
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
Click to expand...
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 to?


1212 3000K80Min 108 COBS @1400 mA ON 1.813 PROFILE HEATSINK
192 SQ.FT. CANOPY 94% EFFICIENT DRIVER @8.5 CENTS PER KWH
Total power watts at the wall: 5909.92
Cobs power watts: 5555.33
Total voltage forward: 3968.09
Total lumens: 833255.69
Total PAR watts assuming 10% loss: 2286.37
Total PPF: 12346.41
PPFD based on canopy area: 692.16
PAR watts per sq.ft.: 11.91
Cob efficiency: 45.73%
Power watts per sq.ft.: 28.93
Voltage forward per cob: 36.74
Lumens per watt: 149.99
Heatsink riser thickness / number of fins / fin's length: 0.3in/6/0.95in
Heatsink area per inch: 100.94 cm^2
Total heat watts: 2999.88
umol/s/W: 2.22 LER: 328.00 QER: 4.86
Heatsink length passive cooling @120cm^2/heatwatt: 3566 inches
Heatsink length active cooling @40cm^2/heatwatt: 1189 inches
COB cost dollar per PAR watt: $0.57
Electric cost @12/12 in 30 days: $180.84
Electric cost @18/6 in 30 days: $271.27
Cost per cob: $12.0
Heatsink cost per inch cut: $0.66
Total cobs cost: $1296.0
Total heatsink passive cooling cost: $2353.56
Total heatsink active cooling cost: $784.74


1818 3000K80Min 108 COBS @1400 mA ON 1.813 PROFILE HEATSINK
192 SQ.FT. CANOPY 94% EFFICIENT DRIVER @8.5 CENTS PER KWH
Total power watts at the wall: 8516.97
Cobs power watts: 8005.96
Total voltage forward: 5718.54
Total lumens: 1226849.87
Total PAR watts assuming 10% loss: 3366.36
Total PPF: 18178.32
PPFD based on canopy area: 1019.11
PAR watts per sq.ft.: 17.53
Cob efficiency: 46.72%
Power watts per sq.ft.: 41.70
Voltage forward per cob: 52.95
Lumens per watt: 153.24
Heatsink riser thickness / number of fins / fin's length: 0.3in/6/0.95in
Heatsink area per inch: 100.94 cm^2
Total heat watts: 4243.16
umol/s/W: 2.27 LER: 328.00 QER: 4.86
Heatsink length passive cooling @120cm^2/heatwatt: 5044 inches
Heatsink length active cooling @40cm^2/heatwatt: 1681 inches
COB cost dollar per PAR watt: $0.74
Electric cost @12/12 in 30 days: $260.62
Electric cost @18/6 in 30 days: $390.93
Cost per cob: $23.0
Heatsink cost per inch cut: $0.66
Total cobs cost: $2484.0
Total heatsink passive cooling cost: $3329.04
Total heatsink active cooling cost: $1109.46
 
Godfather420

Godfather420

Well-Known Member
ttystikk said:
Cree CXB3590 3500K 80 CRI CD bin 72V, four to a Meanwell HLG-185H-C700B driver with the dimming leads capped so it pulls 8% over max, for a total of 54W per chip x 4 chips = 216W, driver adds the difference to get a Kill-a-Watt verified 225W from the wall. King Brite glass 80 degree lenses round out the optics package.
Click to expand...
As for dimming, definitely be running type b's. Just finished up our custom pcb that will control 4 channels of drivers and 2 fans.
 
Godfather420

Godfather420

Well-Known Member
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
Click to expand...
1818 3000K80Min 108 COBS @1100 mA ON 1.813 PROFILE HEATSINK
192 SQ.FT. CANOPY 94% EFFICIENT DRIVER @8.5 CENTS PER KWH
Total power watts at the wall: 6566.84
Cobs power watts: 6172.83
Total voltage forward: 5611.66
Total lumens: 980036.89
Total PAR watts assuming 10% loss: 2689.13
Total PPF: 14521.28
PPFD based on canopy area: 814.09
PAR watts per sq.ft.: 14.01
Cob efficiency: 48.40%
Power watts per sq.ft.: 32.15
Voltage forward per cob: 51.96
Lumens per watt: 158.77
Heatsink riser thickness / number of fins / fin's length: 0.3in/6/0.95in
Heatsink area per inch: 100.94 cm^2
Total heat watts: 3209.87
umol/s/W: 2.35 LER: 328.00 QER: 4.86
Heatsink length passive cooling @120cm^2/heatwatt: 3816 inches
Heatsink length active cooling @40cm^2/heatwatt: 1272 inches
COB cost dollar per PAR watt: $0.92
Electric cost @12/12 in 30 days: $200.95
Electric cost @18/6 in 30 days: $301.42
Cost per cob: $23.0
Heatsink cost per inch cut: $0.66
Total cobs cost: $2484.0
Total heatsink passive cooling cost: $2518.56
Total heatsink active cooling cost: $839.52


CXB3590CD36V3500K 108 COBS @1.75A ON 1.813 PROFILE HEATSINK
198 SQ.FT. CANOPY 94% EFFICIENT DRIVER @8.5 CENTS PER KWH
Total power watts at the wall: 7136.17
Cobs power watts: 6708
Total voltage forward: 3833
Total lumens: 1097429
Total PAR watts assuming 10% loss: 3192
Total PPF: 14842.8
PPFD based on canopy area: 806.9
PAR watts per sq.ft.: 16.12
Cob efficiency: 52.87%
Power watts per sq.ft.: 33.88
Voltage forward per cob: 35.49
Lumens per watt: 163.6
Heatsink riser thickness / number of fins / fin's length: 0.3in/6/0.95in
Heatsink area per inch: 100.94 cm^2
Total heat watts: 3161
umol/s/W / CRI: 4.65 / Estimated
Heatsink length passive cooling @120cm^2/heatwatt: 3758 inches
Heatsink length active cooling @40cm^2/heatwatt: 1253 inches
COB cost dollar per PAR watt: $1.61
Electric cost @12/12 in 30 days: $218.87
Electric cost @18/6 in 30 days: $328.05
Cost per cob: $47.62
Heatsink cost per inch cut: $0.66
Total cobs cost: $5143
Total heatsink passive cooling cost: $2480
Total heatsink active cooling cost: $826

Well by this math, I'll take the 1818
 
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