A further deduction, implied but not stated in the results, is this: Table 2's accurate prediction of constant hue wavelengths for illuminant D50 implies that, for a given dichromat, confusion hues and residual hues in one illuminant remain the same/constant hues in other illuminants. Their wavelengths can be predicted for any illuminant by the Table 2 (Eqn 1) method. This allows prediction of an individual dichromat's color discrimination ability in work (etc) situations for any likely illuminants.