Am 25.11.2013 20:31, schrieb Cousin Ricky:

>    #local c_Color = rgb Emissive2RGB (Flux_map);

If I understand the LightsysIV code correctly, this macro first computes 
a color in XYZ space using Emissive2xyz, then converts that straight 
into RGB. So far, so good.

However, the Emissive2xyz macro not only does an integration over the 
whole spectrum, but it also normalizes the brightness in such a way that 
the X, Y and Z channels sum up to 1.0.


Thus, LightsysIV is apparently unsuited for specifying both brightness 
/and/ hue via one single spectral function (or spline).

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