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 λ m to the flux of wavelength λ (figure 13 ), the two radiations producing equally intense luminous sensations under specific photometric conditions and λ m 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...
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