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Why does an LED Revit family emit various colors in a rendering?

This is the result of the IES file(s):

Revit seems to have an issue with "reading" absolute IES files for LED lighting fixtures. The IES file notes a "-1" for the initial lumens value.

A discretionary approach is to change the "-1" to the initial lumen value of the LED lighting fixture, save (you may want to add characters to the end of the filename to differentiate it from the original IES file) and reload the IES file in the Photometric Web File parameter.