In Ive's SpectralRender package, a comment in spectral_lights.inc reads:
"NOTE: I'm cheating a bit with the Phillips[sic] lamps as they have
sometimes significant peaks in between the 10nm steps and as those
peaks are the most interesting part for specular rendering I won't
I wasn't satisfied, so I wrote a module that integrates the spectral
curves instead of just sampling them. Not only for the Philips lamps,
but the Mitsubishi lamps as well, the difference is noticeable.
The user is also given better control over light source luminosities,
and the luminosities of the preview mode are coordinated with those of
the final spectral mode render. Many thanks to Scott for your
assistance in this matter.
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