You can easily see the brightest green light ray is emanating from a
diagonal of green colors seemingly aligning with the cameras viewpoint,
hence less diffusion into other colors. Even those better colors in the
filtered image at top is losing something with the mixing. Who knows
though, maybe this is correct behavior in reality, as you may have
already surmised.
Too bad too, because its that real stained glass image you would want to
do this way. Have to go looking inside some churches to find out what
should be. I think those really colorful light beams are from really
colorful (and large pieced) stained glass windows.

-- 
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