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nx divisions will correspond to a reflectance of X per cent, in accordance with the formula:
Figure 1

Generalised reflectometer showing experimental set-ups for the two calibration methods

Figure 2

Generalised reflectometer, incorporating an integrating sphere in the receiver

    4. Spectral tristimulus values for the CIE 1931 standard colormetric observer2[11]

    This table is taken from CIE publication 50 (45) (1970)

λ                                  x̅ (λ)   y̅ (λ)       z̅ (λ)
nm