The light pipe might be "tuned" to work best towards the blue end of the spectrum (away from the O.P.'s choice of Amber).
The key to it being fairly broadband is like GM quoted above - it is designed for "light diffusion" not for undistorted transmission of the light source.
I.E: Same answer as GM's - slightly different viewpoint - it will 'sort-of' work for some changes in the light source but is probably not worth the effort to implement.
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