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Why isn E point (x=0.3333 – y=0.3333) used as a standard illuminant for color matching and ΔE?

April 26, 2017color illuminant matching point standard Used

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Why isn E point (x=0.3333 – y=0.3333) used as a standard illuminant for color matching and ΔE?

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It is used on occasion, but since it represents a purely theoretical illuminant (equal energy at each wavelength) it never occurs in a natural viewing environment. Therefore many prefer to use something like an average daylight distribution (such as Illuminant D65).