TS EN 12665:2011

TS EN 12665:2011 is a reference standard for the basic terms and criteria used when specifying lighting requirements in the field of light and lighting. Standards of this type provide a common language for lighting design, so concepts such as illuminance, glare, uniformity, colour characteristics, and suitability for a visual task are used consistently across different disciplines. This edition is withdrawn, but it remains a useful technical framework for understanding lighting terminology and the logic of specifying requirements.

Core concepts behind lighting requirements

In lighting engineering, a “requirement” is not limited to lamp power or luminaire selection. In general technical context, it also involves the visual task, the function of the space, visual comfort, and energy use. The aim is to ensure adequate visibility, reduce visual fatigue, and support visual performance. A terminology standard helps align the language used by designers, manufacturers, consultants, and installers, making technical communication more consistent.

Why this kind of standard matters in practice

Common terminology is essential when lighting specifications are prepared, because the same word can be interpreted differently from one project to another, complicating measurement, comparison, and acceptance. Terminology standards typically do not mandate specific equipment performance; instead, they clarify the conceptual foundation used to describe lighting quality. For that reason, TS EN 12665:2011 is especially valuable for anyone who needs to connect project documentation, technical specification writing, and the broader family of lighting standards in a coherent way.