6. Glossary
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Photometry
Measurement of quantities relating to radiation as evaluated according to a given spectral relative luminous efficacy function, e.g. V (λ) or V ′ (λ).
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Spectral luminous efficiency
It is the ratio of the energy flux of wavelength λm to the flux of wavelength λ (figure 13), the two radiations producing equally intense luminous sensations under specific photometric conditions and λm being chosen so that the maximum value of this ratio is equal to 1 :
V (λ) for photopic vision (normal eye adapted to luminance levels of at least several candelas per square metre);
V′ (λ) for scotopic vision (normal eye adapted to luminance levels below a few hundredths of candelas per square...
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