03648 IUPAC Gold Book - luminous quantities 10.1351/goldbook.L03648 L03648 current 1 Group of quantities characterizing visible light in terms of the appearance to the human eye. The symbols of luminous quantities may be distinguished by adding a subscript v. The units for luminous quantities are derived from the SI base unit candela. candela https://goldbook.iupac.org/terms/view/C00787 photon quantities https://goldbook.iupac.org/terms/view/P04638 radiant quantities https://goldbook.iupac.org/terms/view/R05047 visible https://goldbook.iupac.org/terms/view/VT07496 Green Book, 2nd ed., p. 30 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf) https://goldbook.iupac.org/terms/view/L03648/html https://goldbook.iupac.org/terms/view/L03648/json https://goldbook.iupac.org/terms/view/L03648/plain Citation: 'luminous quantities' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.L03648 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-06-24T19:01:18+00:00