Thoughts on making Cycles into a spectral renderer

I’d love to have some of the fancy tests from that thread be rerun with spectra. I really liked the tea, lemon, and leaves scene by @rbx775 and would love to see if it could be meaningfully improved using spectral data for some sort of black tea, leaves, and lemon skin. If all that can be located. Even without, though, the spectral sky colors are going to play nicely, I suspect.