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@ja2ke @jaseg @rberger came here to say basically the same thing about LEDs so i looked it up, i always thought LED light was essentially monochromatic unless you purposely widened it, but of course nothing's perfect is it.. bandwidth of 29nm might still be usable though? or you could put a filter on the light as well.

now here's another idea though: tetrachromatic CCD. so you don't even need two cameras