25 COB 5 x 5 .7A PPFD?

Trippyness

Trippyness

Well-Known Member
Hello mates. Just a really simple question comparing a few COBS to get PPFD.

COBs are;
Cree CXB 3590 Any top BIN.
Vero 29
Citizen 48 1212
All 3500K

Woukd love for someone to give me some PPFD numbers running, 25 COBs (1 COB per sqf) at 700ma.
For a side note will be using 25 Pin Heatsinks instead of regular extruded heatsinks.

Trippy
 
Atulip

Atulip

Well-Known Member
Do your own math.

Lm/w divided by LER for the efficiency %
Efficiency % times spectrum QER for the umol/j
Umol/j times watts for ppf
Ppf divided by sq meters for ppfd of your desired space

IE

3590 CD 3500k 33v @ .7A 575w total
207lm / 324 ler = .64
.64 * 4.6 = 2.9 umol/j
2.9 * 575w = 1667
1667 / 2.3m2 = ppfd of 715

There's a math thread around here that shows this better.
 
Trippyness

Trippyness

Well-Known Member
Atulip said:
Do your own math.

Lm/w divided by LER for the efficiency %
Efficiency % times spectrum QER for the umol/j
Umol/j times watts for ppf
Ppf divided by sq meters for ppfd of your desired space

IE

3590 CD 3500k 33v @ .7A 575w total
207lm / 324 ler = .64
.64 * 4.6 = 2.9 umol/j
2.9 * 575w = 1667
1667 / 2.3m2 = ppfd of 715

There's a math thread around here that shows this better.
Click to expand...
Thanks for the math. How does one get LER and QER? Ill look around for the math thread.
 
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