TS 1517 ISO 31-6

TS 1517 ISO 31-6 is a terminology standard within the International System of Units framework, dealing with the names and symbols of quantities and units used for light and related electromagnetic radiation. Its role is to make technical language consistent across photometry and adjacent optical measurement contexts.

In general technical terms, the subject sits at the boundary between photometric quantities, which are tied to human visual response, and electromagnetic radiation quantities, which describe physical radiant energy. Commonly encountered concepts in this area include luminous flux, luminous intensity and illuminance, together with the unit names and symbols used to express them. That consistency matters in lighting engineering, optical metrology and technical documentation, where the same concept should not appear under multiple competing forms.

How the terminology layer supports technical clarity

This standard is about naming and symbol convention rather than test procedures or performance limits. In practice, that means it helps separate photometric language from radiometric language, avoiding confusion between quantities based on human perception and quantities based on measurable electromagnetic power. For teams preparing specifications, drawings or data sheets, such standardization improves readability and reduces ambiguity when quantities are exchanged across languages or disciplines.

• Scope: names and symbols for quantities and units of light and related electromagnetic radiation
• Main purpose: consistent terminology and symbol usage
• Typical context: lighting, optical measurement and technical documentation
• Document type: national adoption related to ISO 31-6 with Amendment 1
• Status: withdrawn standard