> However, I see one well-defined (and probably mathematically optimal) solution.
> What you want is a closest match of rgb colors in the target color space.

That could be the default (I'm not sure what sort of spectra that would 
generate when you had a lot more wavelengths than 4), but how about 
having another parameter (like CRI is used for white light) to determine 
the "width" of the spectrum created? That way if you had said "cri 0" 
after the rgb POV would use the minimum number of non-zero monochromatic 
sources to create the colour (as if the light was created by combining 
laser light). Or if you put "cri 100" it would create the "widest" 
spectrum (maybe by minimising RMS value of the spectrum?) to better 
simulate things like paint and incandescent light.

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