DIY PAR meter, Yeah you heard me
i was wondering why you used a photodiode vs a phototransistor? i was looking threw products and it looks like this one:
has an very similar responce to wavelengths as the graph in your first post, its a bit cheaper too...
Phototransistor output is usually too small in term of resolution to have it be meaningful. The spectral response for the transistor you showed is similar but not quite.
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