I am going to build a grow light for a 4x8 grow. I have tried to download a cob calculator but my phone won't open the file. I would like to figure out what the draw at the wall would be and also the par, PPF, etc.If anyone could run the numbers it would be a big help.
I was thinking of using 18 cxb3590 3500K CD bin rated between 12,000 and 13,000+ lumens. I will be driving these with 3 Mean Well hlg-320-c1400b drivers (6 cobs on each) Any info would be greatly appreciated as I would like to get this project started.
Thanks in advance.
here you go
CXB3590CD36V3500K 18 COBS @1.4A ON 5.88 PROFILE HEATSINK
32 SQ.FT. CANOPY 93% EFFICIENT DRIVER @10 CENTS PER KWH
Total power watts at the wall: 945.16
Cobs power watts: 879
Total voltage forward: 628
Total lumens: 160453
Total PAR watts assuming 10% loss: 446
Total PPF: 2073.9
PPFD based on canopy area: 697.6
PAR watts per sq.ft.: 13.94
Cob efficiency: 56.34%
Power watts per sq.ft.: 27.47
Voltage forward per cob: 34.89
Lumens per watt: 182.54
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: 384
umol/s/W / CRI: 4.65 / Estimated
Heatsink length passive cooling @120cm^2/heatwatt: 177 inches
Heatsink length active cooling @40cm^2/heatwatt: 59 inches
COB cost dollar per PAR watt: $1.92
Electric cost
@12/12 in 30 days: $34.53
Electric cost @18/6 in 30 days: $51.54
Cost per cob: $47.62
Heatsink cost per inch cut: $1.74
Total cobs cost: $857
Total heatsink passive cooling cost: $308
Total heatsink active cooling cost: $102
I would suggest
Citizen.1818C4.3000K 18 COBS @1.4A ON 5.88 PROFILE HEATSINK
32 SQ.FT. CANOPY 93% EFFICIENT DRIVER @10 CENTS PER KWH
Total power watts at the wall: 1408.6
Cobs power watts: 1310
Total voltage forward: 936
Total lumens: 195190
Total PAR watts assuming 10% loss: 536
Total PPF: 2604.96
PPFD based on canopy area: 876.24
PAR watts per sq.ft.: 16.75
Cob efficiency: 45.48%
Power watts per sq.ft.: 40.94
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: 714
umol/s/W / CRI: 4.86 / 80CRI
Heatsink length passive cooling @120cm^2/heatwatt: 330 inches
Heatsink length active cooling @40cm^2/heatwatt: 110 inches
COB cost dollar per PAR watt: $1.08
Electric cost
@12/12 in 30 days: $51.21
Electric cost @18/6 in 30 days: $76.56
Cost per cob: $32.08
Heatsink cost per inch cut: $1.74
Total cobs cost: $577
Total heatsink passive cooling cost: $574
Total heatsink active cooling cost: $191
The 3590 are $35 each and the citizen are $24 if you went with luminus cxm22 they are $19 each and more efficient than citizen
