Epiphany: the Snap function of the Vector Math node will turn a gradient into discrete steps, which means... fully banded colored lights with no gradient falloff to be seen.
Camera is closer, otherwise setup is identical (updated nodes in thread).
Not perfect:
pink light has orange and blue artifacts,
blue light has a white outer band,
white light has a blue artifact
orange light looking good as gold, lol
Different base colors also produce different results.
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toon