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I assume they are referring to spectral flux from what they describe as "energy spectrum of incident light" due to similar units.
Photodiodes typically report a responsivity graph and LEDs report relative spectral emissions. How would I calculate spectral flux (if that is the correct unit)?
The spectral emission and responsivity do not include distance from the emitter to detector, but if I move my LED closer to a photodiode then I expect to see a larger photocurrent, but I have not been able to find an example showing this. Any help would be appreciated.