GB 4785-2007 Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers (English Version)
This standard specifies the technical requirements, test methods and inspection rules for the installation of exterior lighting and light signal devices for vehicles and trailers. This standard applies to M, N and O category vehicles and trailers, etc.
GB 4785-2007 Referenced Document
GB 21259 Headlamps equipped with gas-discharge light sources for motor vehicle