How to calculate efficiency of COBs and drivers

First post here, hola RIU!

Ive been doing much research on building my own LED light setup using CXB3590s, and have come across quite a bit of information, especially from SupraSPL and GrowMau5. I've seen posts where they both describe an efficiency number, for example such as this, from SupraSPL's "CXB3590 1500W" thread:

" @64%
(8 ) CXB3590 3500K CD @ 700mA (23W ea) $380
(1) HLG-185H-C700 $65
184 dissipation W ->66W heat -> "

How did he get this number? I've tried researching on and off for two days now to no avail. I am trying to make a very efficient LED system and would like to know what my efficiency would be based so that I can brainstorm my optimal setup.

For cobs : Try searching users mr.flux , stardustsailor, alesh and LER QER ..

Usual method is by integrating an SPD (spectrum) curve to know LER of a spectrum.
LER number equates to how many lumens/W that spectrum would emit @100% efficiency, you can use it to work out efficiency of a given spectrum in a given application.

Example : If LER of your cob is 325, and you have it reaching 208 lumens/W => 208 / 325 => 64% efficiency

There are some older posts you should be able to find with above 'key words', here is an interesting post from @stardustsailor comparing 2 spectrums with very different LER and efficiencies .. touches other aspects of efficacy too : https://www.rollitup.org/t/cxa-3000k-80-vs-93-cri-an-estimation.833171/


For drivers, it's usually in the datasheet .. but you can also measure wattage on the DC side, divided by wattage at the plug.

EfficientWatt said:

For cobs : Try searching users mr.flux , stardustsailor, alesh and LER QER ..
Example : If LER of your cob is 325, and you have it reaching 208 lumens/W => 208 / 325 => 64% efficiency

Click to expand...

So if I need to find the LER, then this should be helpful:

"What LER luminous efficacy of radiation and QER quantum efficacy (?) of radiation are and how they can be calculated from a "spectrum curve"; https://www.rollitup.org/t/math-behind.868988/"