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  • ISO
    ISO/CIE 23539:2023 Photometry - The CIE system of physical photometry
    Edition: 2023
    $517.03
    / user per year

Content Description

This document specifies the characteristics of the system of physical photometry established by the CIE and accepted as the basis for the measurement of light. It defines the photometric quantities, units and standards that make up the CIE system of physical photometry and that have been officially accepted by the Comité International des Poids et Mesures (CIPM). This comprises:

—    the definition of photometric quantities, symbols and units;

—    the definition of CIE spectral luminous efficiency functions for photopic vision, scotopic vision, mesopic vision and 10° photopic vision;

—    the definition of CIE photometric observers that conforms to these functions;

—    the definition of maximum luminous efficacy for photopic vision, mesopic vision, scotopic vision and 10° photopic vision.



About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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