Overview
ISO 80000-7:2019/Amd 1:2025 is Amendment 1 to ISO 80000-7 (Quantities and units - Part 7: Light and radiation). Published by ISO and prepared by Technical Committee ISO/TC 12, this amendment updates how normative references and definitions are cited in the Part 7 document. It aligns the part explicitly with the International System of Units (SI) and clarifies where names, symbols, definitions and units for light- and radiation-related quantities are declared.
Key topics and requirements
- Normative reference added: The amendment replaces the prior statement that there were no normative references with a specific, binding reference to the BIPM publication The International System of Units (SI), 9th edition (2019). This makes the SI definitions and rules normative for Part 7.
- Clarification of terms and definitions: Clause 3 is revised so that names, symbols, definitions and units for quantities used in light and radiation are given in Table 1 and in the International System of Units (SI). This explicitly anchors Part 7 terminology and units to SI conventions.
- Editorial and conformity context: The amendment follows ISO/IEC Directives and reminds implementers about intellectual property and patent considerations typical of ISO documents.
Practical applications
This amendment reinforces consistent use of SI units and standard terminology for all applications involving light and optical radiation, including:
- Metrology and calibration laboratories ensuring measurement traceability to SI
- Manufacturers of photometric and radiometric instruments (spectrometers, sensors, light meters)
- Lighting designers, architects and building services professionals specifying luminance and illuminance
- Researchers and engineers in optics, imaging, remote sensing and health & safety (e.g., optical radiation exposure)
- Regulatory bodies and standards developers referencing consistent unit and symbol usage
By mandating the SI 9th edition as normative for Part 7, the amendment helps users avoid ambiguity in unit usage and supports interoperability across measurements, specifications and documentation.
Related standards
- ISO 80000 series (Quantities and units) - Part 7 is one element of the broader ISO 80000 family.
- The International System of Units (SI), BIPM, 9th edition (2019) - now a normative reference for ISO 80000-7.
Keywords: ISO 80000-7:2019/Amd 1:2025, quantities and units, light and radiation, SI units, BIPM, photometry, radiometry, metrology, standards.
