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White is typically defined by something such as mean noon sunlight. That works pretty well for many purposes, but is slightly less than objective, because it is tied to radiation at a specific temperature without giving a solid reason why that temperature and not some other should be chosen.
This difficulty can be avoided by turning to Fourier theory, in which a spectrum such that the power per unit frequency interval is evenly distributed across all frequencies, has special mathematical significance. Light having this property (within the visual band) could be said to be absolute white. I am wondering what its color temperature is -- that is, the temperature of the blackbody whose output most closely matches it in color.
So given this wide variability in human perception, I am not sure that any new definition of white would make a difference to what we see.
Quote from: evan_auSo given this wide variability in human perception, I am not sure that any new definition of white would make a difference to what we see.And that's why they don't change it. There's no need for a change.