TS 12133

TS 12133 is a terminology standard that gathers the terms and definitions used in lighting engineering. Based on IEC 60050, section 845, it provides a common technical language for topics such as light, vision, colour vision, colorimetry, emission, optical properties, light sources, lamp components, lighting technique, daylighting, luminaires, and visual signalling.

What this lighting vocabulary is meant to organise

In lighting practice, accurate terminology matters because physical light behaviour, human visual response, and colour-related measurement are not the same thing. Concepts such as luminous flux, brightness, spectral characteristics, radiometric emission, and perception are closely related, but each describes a different technical aspect. The subject of this standard is the naming and defining of those concepts within the lighting field.

In general technical context, lighting covers more than artificial lamps alone. It also includes daylight use in indoor and outdoor environments, the structure of luminaires, and the legibility of visual signs. Vocabulary standards help designers, engineers, manufacturers, and testing personnel use the same term with the same meaning across specifications, reports, and product documentation, reducing ambiguity in communication.

• The document focuses on terms and definitions for lighting and vision.
• It includes related areas such as colour vision, colorimetry, and emission.
• It brings together naming for light sources, lamp parts, and luminaires.
• It also covers daylighting and visual signalling as application areas.
• This record is a terminology standard, not a general performance standard.