alesh
Well-Known Member
So I'll assume that you have 3000K/80CRI AB bin CXA3070.I have CXA3070. Total number is 9, to be precise. Also, I have 3 units of HLG-185H-C1400A. So, I can power 3 CXA3070s, i guess...
I would like to cover 1 square meter if possible. That's my main problem right now. How to calculate needed number of CXA3070s or any other model of LED chips, according to area I want to cover?
Thanks for reply @alesh
At 1400mA, they're 43.3% efficient, each COB producing 22.6W of light (refer to this thread). Cree's 3000K 80CRI produces 4.87 µmol per each joule of radiated light, that means each COB at 1.4A produces about 110 µmol of photons each second. You've got 9 of them over 1m^2, making it 990µmol/s/m^2. There will be some scatter and absorption losses, so I'd say that 900 µmol/s/m^2 is more likely value. That's a good value and should grow some nice buds
500 (maybe even less)-1200 µmol/s/m^2 averaged are acceptable values with the lower one maxing g/W ratio and the higher one maxing g per area ratio. Lower values could result in fluffy/not dense product and higher value could cause bleaching.