TS EN 12665

TS EN 12665 is the standard that establishes the basic terms used when describing lighting needs and the framework for expressing those needs. In practical terms, it provides a common technical language for light and lighting so that requirements can be stated consistently across different applications.

A common language for lighting terminology

Lighting design and assessment involve concepts such as illuminance, luminance, glare, light distribution and visual comfort. In general technical context, this standard helps define how those ideas are understood and used when discussing lighting requirements. That makes it easier to communicate clearly across indoor, outdoor, workplace and other lighting situations.

How lighting requirements are framed

The document also sets out a framework for specifying lighting requirements, indicating the aspects that should be considered when those requirements are written. Rather than focusing on a single numeric target, this kind of framework supports a broader view that can include the visual task, the intended use of the space, comfort, and surrounding conditions. For users and specifiers, that means the language of lighting performance can be organized in a more coherent way.

Because this is a terminology-and-criteria standard, it should be understood as a reference for defining and describing lighting requirements, not as a narrow product specification for one lamp, luminaire or application type. Its value lies in harmonizing concepts and improving consistency when lighting needs are documented.

• Brings together the basic terms used in lighting applications.
• Provides a conceptual framework for stating lighting requirements.
• Supports consistent interpretation of technical lighting language.
• Helps structure the main aspects considered in lighting specification.