Saturday, 29 March 2014

surface mount - SMD LED: How to calculate optical power (in mW) from luminous intensity (in mcd)?



I chose an LED for my application but I need optical power, in mW.


In the data sheet, luminous intensity is shown in mcd but I did not find formulas for calculation although there are graphs, etc.


Where luminous intensity is 180 mcd and viewing angle 120°, etc.


Please provide any necessary formulae for my case.


I could not find the exact formula on this website.




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