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 2026-10-13
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Cited passages: Appendix 2, v1.02, 22 March 2021, §3.1, printed pp. 2–3: wavelength convention, normalized functions and interpolation; §3.1, equation (2), printed p. 3: spectral weighting normalized at the defining frequency; §3.1, printed p. 3: photopic and scotopic luminous efficiency functions.
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