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function by stating “the spectral luminous efficiency function for a point source may be adequately represented by the Judd modified V(λ) function” (CIE, 1988) and “the Judd modified V(λ) function would be the preferred function in those conditions where luminance measurements of short wavelengths consistent with color normal observers is desired” (CIE, 1990). The CIE 1931 V(λ) function and the CIE 1978 V(λ) function are shown in Fig. 16.6. The photopic eye sensitivity function has maximum sensitivity in the green spectral range at 555 nm, where V(λ) has a value of unity, i.e. V(555 nm) = 1. Inspection of the figure also reveals that the CIE 1931 V(λ) function underestimated the eye sensitivity in the blue spectral range (λ < 460 nm). Numerical values of the CIE 1931 and CIE 1978 V(λ) function are tabulated in Appendix 16.1. Also shown in Fig. 16.6 is the scotopic eye sensitivity function V ′(λ). The peak sensitivity in the scotopic vision regime occurs at 507 nm. This value is markedly shorter than the peak sensitivity in the photopic vision regime. Numerical values of the CIE 1951 V ′(λ) function are tabulated in Appendix 16.2. 16.3 Eye sensitivity function 281PDF Image | Human eye sensitivity and photometric quantities
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