ISO 80000-7:2019/PRF Amd 1

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ISO 80000-7:2019, which is titled "Quantities and units — Part 7: Light and radiation," defines the terms, symbols, definitions, and units for quantities used in light and optical radiation. This standard is part of the ISO/IEC 80000 series, which aims to harmonize terms, definitions, and symbols in science and engineering. The "PRF" likely refers to the "Proof of Reading" or "Proof of Registration" within the context of using this standard, and "1" likely refers to the specific part or section within the document.