GB 5920-2024 English PDF

GB 5920-2024: Light-signalling devices and systems for motor vehicles and their trailers
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GB 5920-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.20
CCS T 38
Replacing GB/T 5920-2019, etc.
Light-Signaling Devices and Systems for Motor Vehicles and
Their Trailers
ISSUED ON. SEPTEMBER 29, 2024
IMPLEMENTED ON. JULY 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Judgment of the Same Type... 9
5 General Requirements... 9
6 Requirements for Light Source... 12
7 Requirements for Photometric Characteristics... 12
8 Chromaticity Requirements for Light-Signaling Devices... 16
9 Test Method... 16
10 Inspection Rules... 20
11 Implementation of the Standard... 22
Appendix A (Normative) Special Provisions of Category A2 Front Position Lamp.. 23
Appendix B (Normative) Special Provisions of Light-Signaling Projection Function
... 24
Appendix C (Normative) Minimum Photometric Angle Range... 28
Appendix D (Normative) Light Intensity Distribution... 33
Light-Signaling Devices and Systems for Motor Vehicles and
Their Trailers
1 Scope
This Document specifies the same type determination, general requirements, light source
requirements, photometric characteristics requirements, chromaticity requirements, test
methods and inspection rules of light-signally devices and devices and systems for motor
vehicles and their trailers.
This Document applies to the design, manufacture and acceptance of light-signaling devices
and systems such as front position lamps, rear position lamps, direction-indicator lamps, stop
lamps, reversing lamps, end-outline marker lamps, parking lamps, daytime running lamps, rear-
registration plate illuminating devices, rear fog lamps, maneuvering lamps, side marker lamps,
and light-signaling projection units used in Categories-M, -N, and -O vehicles.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB 4785 Prescription for installation of the external lighting and light signaling devices
for motor vehicles and their trailers
UN R37 Uniform provisions concerning the approval of filament lamps for use in
approved lamp units of power-driven vehicles and of their trailers, UN
UN R 128 Uniform provisions concerning the approval of light emitting diode (LED) light
sources for use in approved lamp units on power-driven vehicles and their trailers, UN
R.E.5 Consolidated Resolution on the common specification of light source categories,
UN
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB 4785 and the
function by projecting symbols on the road surface.
4 Judgment of the Same Type
Devices that do not differ in the following main features are considered to be of the same type.
--- Manufacturer;
--- The number, type, lighting principle, and light source module structure of the used
replaceable or non-replaceable light sources;
--- The number and structure of main optical components (e.g., reflectors, photometric
mirrors, light guides, variable light intensity controllers, etc.).
5 General Requirements
5.1 Front/rear position lamps
5.1.1 When the front/rear position lamps and other functions form a mixed lamp, the two are lit
at the same time, the chromaticity shall comply with the chromaticity requirements of the
corresponding mixed function specified in GB 4785.
5.1.2 The front/rear position lamps that share the light source with other functions may be
designed to operate with an additional system for adjusting the light intensity. In this case, for
the rear position lamps that share the light source with the stop lamp, multiple light sources
shall be designed in parallel, or the function shall be equipped with a fault monitoring system.
5.1.3 The circuit connection of the Category A2 front position lamp shall comply with the
provisions of Appendix A.
5.2 Direction-indicator lamp
5.2.1 Classification
5.2.1.1 Front direction-indicator lamps are classified into Categories-1, -1a and -1b devices
according to their photometric characteristics.
5.2.1.2 Rear direction-indicator lamps are classified into Categories-2a and -2b devices
according to their photometric characteristics.
5.2.1.3 Side direction-indicator lamps are classified into Categories-5 and -6 devices according
to their photometric characteristics.
5.2.2 Requirements for sequential activation
5.2.2.1 Each light source shall remain lit after activation until the lighting cycle ends. The
sequential activation change process shall end within 200ms after the lighting cycle begins.
5.2.2.2 The sequential activation change shall be gradually lit from the inside to the outside of
the light-transmitting surface at a uniform speed.
5.2.2.3 Continuous light signals shall be provided and the light-transmitting surface shall not
oscillate in the vertical and horizontal directions (at most one direction change is allowed in the
vertical direction).
5.2.2.4 In the direction perpendicular to the reference axis, the interval between two adjacent
or tangential parts of the light-transmitting surface of the direction-indicator lamp that is
activated sequentially shall not exceed 50mm.
5.2.2.5 If there is a gap in the projection of the light-transmitting surface in the direction
perpendicular to the reference axis, it shall be ensured that the overlapping parts of the
projection in the vertical direction change synchronously in the horizontal direction.
5.2.2.6 If there is a gap in different light-transmitting surfaces, the gap shall not be used for
other illuminating and light-signaling functions.
5.2.2.7 The ratio of the lengths of the horizontal and vertical sides of the minimum
circumscribed rectangle (with the long side parallel to the Plane H) of the orthogonal projection
of the apparent surface in the direction of the reference axis on the plane perpendicular to the
reference axis shall not be less than 1.7.
5.3 Light-signaling projection function
5.3.1 The pattern of the light-signaling projection shall consist of simple geometric figures
and/or single letters, which may be defined by the manufacturer and stated in the user manual.
The choice of pattern shall not cause ambiguity.
5.3.2 During the on-time, the pattern of the light-signaling projection shall only change the
length, size ratio, projection direction or position of the pattern.
5.3.3 The location and circuit connection of the light-signaling projection function shall comply
with the provisions of Appendix B.
5.3.4 When the steering projection function and the reverse projection function are turned on
sequentially, the following requirements shall be met.
a) After projection, the sequentially projected symbols shall remain in the projection state
until the lighting rhythm ends;
b) The sequential turning-on timing of the steering projection function shall be consistent
with the direction-indicator lamp, and the changing process of the sequential turning-on
of the reverse projection function shall end within 200ms after the lighting rhythm begins;
6 Requirements for Light Source
6.1 Replaceable light sources
6.1.1 The light source shall be able to be installed in the correct position of the lamp even in
the dark without using tools.
6.1.2 The types and performance requirements of replaceable filament light sources and LED
(light-emitting diode) light sources used in the device or system shall comply with the
provisions of UN R37, UN R128 and R.E.5.
6.2 Non-replaceable light sources
6.2.1 The light source can only be replaced as a whole with the light signal device and system.
6.2.2 The light source module used in the device or system shall be able to prevent mis-
operation of the light source module, and its design shall meet the following requirements.
a) Ensure that each light source module can only be installed in the correct position and can
only be removed with tools;
b) If multiple light source modules are used in the same lamp body, ensure that light source
modules with different characteristics cannot be interchanged;
c) Even if tools are used, the light source module cannot be mechanically interchanged with
other replaceable light sources.
7 Requirements for Photometric Characteristics
7.1 Requirements within the light intensity distribution range
7.1.1 The light intensity in the direction of the reference axis shall meet the requirements of
Table 1.
7.5 Additional requirements for devices with variable light intensity controllers
7.5.1 The light intensity on the reference axis upward of the device shall meet the requirements
for variable light intensity in Table 1; and the minimum light intensity within the photometric
angle range shall meet the requirements in Table 2.
7.5.2 The start-up time of the maximum and minimum light intensity levels shall be measured
respectively; and the start-up time of the minimum light intensity level shall be no greater than
that of the maximum light intensity level. The start-up time is the time required for the light
intensity of the reference axis to reach 90% of the stable value of the light intensity of the
reference axis from the power supply being turned on.
7.5.3 In the event of a failure of the variable light intensity controller or when the ambient light
is less than 1000lx, the device shall comply with the light intensity requirements of the steady
light intensity level in Table 1.
7.6 Additional requirements for front position lamps equipped with infrared radiation
generators
If it contains one or more infrared radiation generators, the photometric characteristics and
chromaticity of the front position lamp shall meet the requirements both when the infrared
radiation generator is working and when it is not working. The photometric characteristics shall
meet the requirements of 7.1 and 7.2; and the chromaticity shall meet the corresponding
provisions in GB 4785.
8 Chromaticity Requirements for Light-Signaling Devices
8.1 Chromaticity requirements shall comply with the requirements of GB 4785, except for the
following cases.
a) Red light emitted by the rear-registration plate illuminating device in combination or
composite with other lamps;
b) Red light emitted by the reversing lamp within the range specified in D.2.6 b).
8.2 The chromaticity of the light-signaling projection function shall be the same as the
corresponding light-signaling function.
9 Test Method
9.1 Requirements for test darkroom, device and equipment
9.1.1 The test darkroom shall be free of light leakage, and its environmental conditions shall
not affect the transmission performance of the light beam and the accuracy of the instrument.
9.1.2 The ambient temperature of the test darkroom shall be 23℃±5℃, and the relative
humidity shall be no greater than 80%.
9.1.3 The photometric test shall use a DC voltage-stabilized/current-stabilized power supply,
and the accuracy of the electrical instrument shall be no less than Class 0.2.The capacity of the
power supply shall be sufficient to ensure the rapid increase of the power pulse.
9.1.4 The illuminance meter shall be a Class I illuminance meter specified in the national
verification regulations.
9.1.5 The measurement distance of the photometric characteristics shall ensure that the inverse
square law of distance in photometry can be applied. The test distance for maneuvering lamps
and light-signaling projection symbols shall be at least 3m.
9.1.6 Observed from the reference center, the opening angle of the light receiver is between 10'
and 1°.
9.1.7 The angular deviation of each measuring direction shall not exceed 15'.
9.1.8 The initial measurement position of the device shall be determined according to the
reference axis and reference center specified by the manufacturer.
9.1.9 When testing the brightness of the rear-registration plate illuminating device, a colorless
diffuse reflection surface with a known diffuse reflection coefficient shall be used. The colorless
diffuse reflection surface shall be placed in the normal position of the registration plate
installation and 2mm in front of the fixed plate. The size of the colorless diffuse reflection
surface is the same as the size of the registration plate or larger than the size of a measurement
point area; and its center is placed at the center of the measurement point.
9.2 Test requirements
9.2.1 Test voltage for non-replaceable light sources
9.2.1.1 For devices that are not equipped with an electric light source controller or a variable
light intensity controller, the test shall be carried out at 13.5V or 28.0V, respectively.
9.2.1.2 For devices equipped with electric light source controllers or variable light intensity
controllers, the photometric characteristics test shall be carried out according to the
manufacturer's instructions.
a) When the variable light intensity controller is part of the lamp, the manufacturer shall
specify the input voltage of the lamp. If not specified, it shall be 13.5V or 28.0V
respectively;
b) When the variable light intensity controller is not part of the lamp, the input voltage of
the lamp shall be the voltage specified by the manufacturer.
When the device is installed in the vehicle interior and there are multiple installation conditions
(such as different installation angles, different vehicle safety glass colors), the photometric
characteristics and chromaticity tests shall be carried out for various conditions combined with
all corresponding window samples.
9.2.5 Test of rear-registration plate illuminating device
The brightness value of the test shall be corrected according to the diffuse reflection coefficient.
9.2.6 Test of light-signaling devices and syst...