= Photopic vision
{wiki}
<Photopic vision> means vision under light-adapted conditions. Standard <photometry> here uses the <photopic luminous efficiency function>; <scotopic vision> uses a different weighting for dark-adapted conditions. The response function and adaptation conditions must be stated when comparing <luminous fluxes>.<The International System of Units (SI), ninth edition, SI Brochure/Mise en pratique for the definition of the candela and associated derived units for photometric and radiometric quantities in the SI>[§3.1, printed p. 3: photopic and scotopic luminous efficiency functions]{ref}
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