PPFD measurements on CXB3590 builds

Just wanted to ask if there are any PPFD measurements using CXB3590's x 8 and using the hlg185 .700 vs the 2 x hlg185 1.400.

In what area?

Meaning what space will you be covering?

coreywebster said:

In what area?

Meaning what space will you be covering?

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Sorry, I thought there was a standard of one square meter. That was what I was needing is the measurements of both power supplies at their full potential on one square meter.

krankenphleger said:

Sorry, I thought there was a standard of one square meter. That was what I was needing is the measurements of both power supplies at their full potential on one square meter.

Click to expand...

8x cxb3590 (3500k) @700mA

CXB3590CD36V3500K 8 COBS @0.7A ON 1.813 PROFILE HEATSINK
1 SQ.M. CANOPY 95% EFFICIENT DRIVER @11 CENTS PER KWH
Total power watts at the wall: 192.63
Cobs power watts: 183
Total voltage forward: 262
Total lumens: 37952
Total PAR watts assuming 10% loss: 105
Total PPF: 488.25
PPFD based on canopy area: 488.25
PAR watts per sq.m.: 105.0
Cob efficiency: 64.01%
Power watts per sq.m.: 183.0
Voltage forward per cob: 32.72
Lumens per watt: 207.39
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: 66
umol/s/W / CRI: 4.65 / Estimated
Heatsink length passive cooling @120cm^2/heatwatt: 78 inches
Heatsink length active cooling @40cm^2/heatwatt: 26 inches
COB cost dollar per PAR watt: $3.63
Electric cost @12/12 in 30 days: $8.13
Electric cost @18/6 in 30 days: $11.94
Cost per cob: $47.62
Heatsink cost per inch cut: $0.66
Total cobs cost: $381
Total heatsink passive cooling cost: $51
Total heatsink active cooling cost: $17

8X CXB3590(3500k) @1400mA

CXB3590CD36V3500K 8 COBS @1.4A ON 1.813 PROFILE HEATSINK
1 SQ.M. CANOPY 95% EFFICIENT DRIVER @11 CENTS PER KWH
Total power watts at the wall: 411.58
Cobs power watts: 391
Total voltage forward: 279
Total lumens: 71373
Total PAR watts assuming 10% loss: 198
Total PPF: 920.7
PPFD based on canopy area: 920.7
PAR watts per sq.m.: 198.0
Cob efficiency: 56.34%
Power watts per sq.m.: 391.0
Voltage forward per cob: 34.89
Lumens per watt: 182.54
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: 171
umol/s/W / CRI: 4.65 / Estimated
Heatsink length passive cooling @120cm^2/heatwatt: 203 inches
Heatsink length active cooling @40cm^2/heatwatt: 68 inches
COB cost dollar per PAR watt: $1.92
Electric cost @12/12 in 30 days: $16.8
Electric cost @18/6 in 30 days: $24.95
Cost per cob: $47.62
Heatsink cost per inch cut: $0.66
Total cobs cost: $381
Total heatsink passive cooling cost: $134
Total heatsink active cooling cost: $44

This is using the cob calculator from a thread on here somewhere.

The second one @1400 mA does not take into account two drivers so divide the forward voltage, cob watts ect by 2

Hope that's of use to you.

EDIT..

PER DRIVER

Total power watts at the wall: 205.26
Cobs power watts: 195
Total voltage forward: 140
Total lumens: 35595
Total PAR watts assuming 10% loss: 99
Total PPF: 460.35
PPFD based on canopy area: 460.35
PAR watts per sq.m.: 99.0
Cob efficiency: 56.34%

Here is the link for the calculator, you need to download it and run it on java. Download it from bggrass's signature at the bottom of any of his posts to get the working updated version.

https://www.rollitup.org/t/diy-cob-led-calculator.890214/

coreywebster, thanks a ton! Very helpful and much faster than I thought this information would come.

krankenphleger said:

coreywebster, thanks a ton! Very helpful and much faster than I thought this information would come.

Click to expand...

Haha no worries, get that calculator downloaded so you can play around with it...
The real thanks goes to @bggrass for making it and to @SupraSPL for providing the data on which its based. (nice to see you back BTW SupraSPL)

krankenphleger said:

Sorry, I thought there was a standard of one square meter. That was what I was needing is the measurements of both power supplies at their full potential on one square meter.

Click to expand...

while the units of PPFD are per square meter, it is a spot measurement by nature and there is no requirement to measure it in a one square meter space. Kind of like how you can read miles per hour with your speedometer without driving a whole hour

CobKits said:

while the units of PPFD are per square meter, it is a spot measurement by nature and there is no requirement to measure it in a one square meter space. Kind of like how you can read miles per hour with your speedometer without driving a whole hour

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I understand what you are saying about taking spot readings. When you buy a car the horse power of the motor determines how fast the car will travel measured in MPH or KPH. That is basically where I am coming from and I am sure you know this. It would seem that the light industry would come up with a measurement standard, for instance, a nine point check per square meter just to give an idea what the average PPFD of a given light and power source would be.

@krankenphleger, They do do that with the lumen or PPF values. Just divide that by the surface area to get the average PPFD. To be more precise deduct the wall losses.

Just blows me away at all the help available on these boards. Thanks for all the info.