> Yes, it will give more physically correct render for strange lights. But the
> most important aspect of spectral rendering is more "natural" color behaviour.
> The problem of rgb illumination model is that the primary colors are
> "orthogonal". So when you say "blue", and "red" they have absolutely nothing in
> common. So a red light will give no illumination to red object, and red and blue
> objects will have no radiosity effect on each other at all.

This is what happens IRL though, isn't it? An sRGB red light source will 
have a very narrow spectrum and almost no overlap at all with the 
reflective spectrum of an sRGB blue surface, so it will appear black.

I always avoid zero terms in rgb colours too, not because I'm trying to 
fake anything but I think it is genuinely more realistic for natural 
surfaces and lights.

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