TS EN 12665

TS EN 12665 is a standard that establishes the basic terms used in light and lighting and provides a framework for specifying lighting requirements. It helps create a common technical language for lighting design, measurement, performance assessment, and the preparation of specifications across different applications.

Why lighting requirements need a separate framework

Lighting is not only about delivering enough light. Visual comfort, task performance, safety, energy use, and the intended function of the space all need to be considered together. This standard presents a structure for the aspects that should be taken into account when defining such requirements. As a result, terms are used consistently across indoor and outdoor lighting work, supporting designers, manufacturers, consultants, and reviewers.

Practical value of a terminology standard

• It supports consistent interpretation of concepts such as illuminance, glare, colour-related characteristics, and related lighting terms.
• It helps systematise which aspects should be considered when preparing a lighting specification.
• It aligns the language used in different projects and technical documents.
• Its coverage is general lighting terminology; it is not a product-specific design rule for a particular luminaire type.

This record represents the TS EN 12665 edition based on EN 12665:2018 and serves as a foundational terminology reference for defining lighting requirements. In practice, it helps make lighting communication clearer and the expression of requirements more precise.