The Punisher
New Member
efficiencyHello guys, RUI is a wonderfull place.
But after spending a lot of time on this forum there are many things i still don't get :
When i c ompare CXB3070 bin AB, and CXB3590 bin CB using the Cree tool, i get those numbers
When i check the thread "COB efficiency spreadsheet" i get different ones
- CXB3070AB : examples @0.7A, 170 lm/w vs 157, @1.4A 147 lm/w vs 137.7
- CXB3590CB : @0.7A 167.9 lm/W vs 150 lm/w, @1.4A 128.5 lm/w vs 119.8
I don't know why ?
Now, if i want to try to make my own data sheet based on the Cree tool, i'm not sure how to procede.
I will try correct me if i'm wrong :
1) Efficiency (%) = (lm/w) / LER, i think at 3000K LER is 325 for both LED so :
CXB3070AB 3000K :
@0.7A efficiency = (157.2 / 325) = 48.4%
@1.4A efficiency = (137.2 / 325) = 42.4%
CXB3590CB 3000K :
@0.7A efficiency = (150.5 / 325) = 46.3%
@1.4A efficiency = (119.8 / 325) = 36.9%
2) PARwatts = efficiency x dissipated watts (with dissipated watts = Amps*Volts)
CXB3070AB 3000K :
@0.7A PARwatts = 48.4 x 23.35 = 11.29 (Which unit is it ?)
@1.4A PARwatts = 42.4 x 49.315 = 20.89
CXB3590CB 3000K 72V:
@0.7A PARwatts = 46.3 x 48.276 = 22.36
@1.4A PARwatts = 36.9 x 103.306 = 38.08
And now i'm in troubles because i would like to go deeper and find PPF but i'm not sure how to do that ! I think it's somthging like that :
3) PPF = PARwatts x convertion factor... What is "convertion factor"? is it QER ? which is the value of that factor ? Same question for QER ?
Based on my research on RIU i think, but i'm not sure QER = 4.66 for Cree CXs 3000K 80CRI.
I will try this formula with convertion factor = QER = 4.66 but it's highly speculitive if not absolutely wrong!
so :
CXB3070AB 3000K :
@0.7A PPF = 11.29 x 4.66 = 52.61 μmol / s
@1.4A PPF = 20.89 x 4.66 = 102.36 μmol / s
CXB3590CB 3000K 72V :
@0.7A PPF = 22.36 x 4.66 = 104.2 μmol / s
@1.4A PPF = 38.08 x 4.66 = 177,45 μmol / s
4) PPFD : now i would like μmol / s / m² Obviously i don't know how to do that !
but idealy i have 2 goals :
a) evaluate the best surface of grow (i don't care that much about vegging, i plan to make a SOG)
b) evaluate the closest distance i can put my leds from the canopy. actualy i don't have any led, i'm just calculating what is my best option : i have space on the ground ( 2 or 3m²), but i don't have much heigh, it's my main problem, only 4 feets (1.2m) and i don't have any better option.
Question what is a good PPFD (i think it's between 800 - 1500 μmol / s / m²,) what is the closest distance, the best set-up etc.
It's a lot of questions, and a long post, if anyone can read that and help me i would appreciate a lot.
Thank you RIU fellows !
But after spending a lot of time on this forum there are many things i still don't get :
When i c ompare CXB3070 bin AB, and CXB3590 bin CB using the Cree tool, i get those numbers
When i check the thread "COB efficiency spreadsheet" i get different ones
- CXB3070AB : examples @0.7A, 170 lm/w vs 157, @1.4A 147 lm/w vs 137.7
- CXB3590CB : @0.7A 167.9 lm/W vs 150 lm/w, @1.4A 128.5 lm/w vs 119.8
I don't know why ?
Now, if i want to try to make my own data sheet based on the Cree tool, i'm not sure how to procede.
I will try correct me if i'm wrong :
1) Efficiency (%) = (lm/w) / LER, i think at 3000K LER is 325 for both LED so :
CXB3070AB 3000K :
@0.7A efficiency = (157.2 / 325) = 48.4%
@1.4A efficiency = (137.2 / 325) = 42.4%
CXB3590CB 3000K :
@0.7A efficiency = (150.5 / 325) = 46.3%
@1.4A efficiency = (119.8 / 325) = 36.9%
2) PARwatts = efficiency x dissipated watts (with dissipated watts = Amps*Volts)
CXB3070AB 3000K :
@0.7A PARwatts = 48.4 x 23.35 = 11.29 (Which unit is it ?)
@1.4A PARwatts = 42.4 x 49.315 = 20.89
CXB3590CB 3000K 72V:
@0.7A PARwatts = 46.3 x 48.276 = 22.36
@1.4A PARwatts = 36.9 x 103.306 = 38.08
And now i'm in troubles because i would like to go deeper and find PPF but i'm not sure how to do that ! I think it's somthging like that :
3) PPF = PARwatts x convertion factor... What is "convertion factor"? is it QER ? which is the value of that factor ? Same question for QER ?
Based on my research on RIU i think, but i'm not sure QER = 4.66 for Cree CXs 3000K 80CRI.
I will try this formula with convertion factor = QER = 4.66 but it's highly speculitive if not absolutely wrong!
so :
CXB3070AB 3000K :
@0.7A PPF = 11.29 x 4.66 = 52.61 μmol / s
@1.4A PPF = 20.89 x 4.66 = 102.36 μmol / s
CXB3590CB 3000K 72V :
@0.7A PPF = 22.36 x 4.66 = 104.2 μmol / s
@1.4A PPF = 38.08 x 4.66 = 177,45 μmol / s
4) PPFD : now i would like μmol / s / m² Obviously i don't know how to do that !
but idealy i have 2 goals :
a) evaluate the best surface of grow (i don't care that much about vegging, i plan to make a SOG)
b) evaluate the closest distance i can put my leds from the canopy. actualy i don't have any led, i'm just calculating what is my best option : i have space on the ground ( 2 or 3m²), but i don't have much heigh, it's my main problem, only 4 feets (1.2m) and i don't have any better option.
Question what is a good PPFD (i think it's between 800 - 1500 μmol / s / m²,) what is the closest distance, the best set-up etc.
It's a lot of questions, and a long post, if anyone can read that and help me i would appreciate a lot.
Thank you RIU fellows !