This standard specifies light distribution performance, test methods and inspection rules of motor vehicle headlamps equipped with filament lamps and sealed beam headlamps.
This standard is applicable to various types of headlamps (gas-discharge source headlamps excluded) used in Categories M and N motor vehicles.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB 4785 Prescription for Installation of the External Lighting and Light-signaling Devices for Motor Vehicles and Their Trailers
GB 15766.1 Filament Lamps for Road Vehicles-Dimensional, Electrical and Luminous Requirements(GB 15766.1-2000, idt IEC 60809:1995)
ECE R37 Uniform Provisions Concerning the Approval of Filament Lamps for Use in Approved Lamp Units of Power-driven Vehicles and of Their Trailers
3 Terms and Definitions
For the purposes of this standard, the terms and definitions established in GB 4785 and the following ones apply.
3.1
Light distribution
Luminosity (e.g. illumination or luminous intensity) distribution of visible light emitted by light fixtures
3.2
Passing beam
A kind of close-range illuminating beam that will not make the other road users ahead, if any, dazzled or discomfortable
