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My question refers to Photon flux spectrum diagrams.
The diagram shows the number of photons at different wavelengths. My question is whether the graph is granular or continuous. Do photons exist at all possible wavelengths, or are there some "forbidden" wavelengths?
--- I want to get a PFD data set but not sure how to treat the 0.5 nm increments in the https://www.nrel.gov/grid/solar-resource/spectra.html (G173-03) Spectral data.
Below my calcuations are in green. I am afraid I am double counting photons the way ive done it so far.
(small note the coloumn D should say PFD and not PPFD*)