# The Road Vehicles Lighting Regulations 1989, Paragraph 1

Extent: E+W+S

A dim-dip device fitted to satisfy regulation 18 shall cause light to be emitted from the dipped-beam filament of each obligatory dipped-beam headlamp, each such light having, so far as is practicable, an intensity of between 10 and 20 per cent of the intensity of the normal dipped beam.

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Source: https://www.legislation.gov.uk/uksi/1989/1796/schedule/3/paragraph/1 (the official version)
Page: https://openlegislation.uk/road-vehicles-lighting-regulations-1989/schedule-3/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.