CIE 183:2008

Definition of the Cut-off of Vehicle Headlights

Issuing bodyCIE
CommitteesInternational Commission on Illumination (CIE)
First issued2008
Latest revision2008
Statusactive
Categoryinternational
Topicsdisability_glare, headlamp_performance, visual
Referencehttps://cie.co.at/publications/definition-cut-vehicle-headlights

Scope

Provides an objective photometric definition and measurement method for the low-beam (dipped-beam) visual cut-off line of vehicle headlights. Correct aiming of low beams is performed visually in Europe and the USA using the cut-off line in the beam pattern, so a precise, uniform definition is needed for consistent interpretation across regulations. Directly governs the boundary between the driver's forward road illumination and the glare imposed on oncoming drivers.

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