GB 5920-2024 Light-signalling devices and systems for motor vehicles and their trailers
1 Scope
This document specifies the same type judgment, general requirements, requirements for light source, requirements for photometric characteristics, chromaticity requirements, test methods and inspection rules of light-signalling devices and systems for motor vehicles and their trailers.
This document is applicable to the design, manufacturing and acceptance of front position lamp, rear position lamp, direction-indicator lamp, stop lamp, reversing lamp, end-outline marker lamp, parking lamp, daytime running lamp, rear-registration plate illuminating device, rear fog lamp, manoeuvring lamp, side marker lamp, light-signalling projection unit and other light-signalling devices and systems used in category M, category N and category O motor vehicles.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 4785 Prescription for installation of the external lighting and light-signalling 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 R128 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 following apply.
3.1
light-signalling device
a unit or a group of units used to send light signals to other road users, indicating the presence of a vehicle or a change in its motion state, to achieve one or more functions
Note: It is referred to as "device" in this document, including one or more of front position lamp, rear position lamp, direction-indicator lamp, stop lamp, reversing lamp, end-outline marker lamp, parking lamp, daytime running lamp, rear-registration plate illuminating device, rear fog lamp, manoeuvring lamp, side marker lamp and light-signalling projection unit.
3.2
light-signalling system
system consisting of multiple devices and control gears on the same side or both sides, which is used to send light signals to other road users, indicating the presence of a vehicle or a change in its motion state
Note: It is referred to as "system" in this document.
3.3
stop lamp
lamp for indicating to other road users in rear of the vehicle that the vehicle is braking
[Source: GB 4785-2019, 3.9.10, modified]
3.3.1
category S1
stop lamps installed in pairs, emitting light of stable luminous intensity
3.3.2
category S2
stop lamps installed in pairs, emitting light of variable luminous intensity
3.3.3
category S3
high stop lamp emitting light of stable luminous intensity
3.3.4
category S4
high stop lamp emitting light of variable luminous intensity
3.4
front position lamp
lamp that indicates the presence and width of the vehicle when viewed from the front of the vehicle
[Source: GB 4785-2019, 3.9.12]
3.4.1
category A1
front position lamp installed at the front of the vehicle, emitting light of stable luminous intensity
3.4.2
category A2
front position lamp installed at the front of the vehicle, emitting light of variable luminous intensity
3.5
rear position lamp
lamp that indicates the presence and width of the vehicle when viewed from the rear of the vehicle
[Source: GB 4785-2019, 3.9.13]
3.5.1
category R1
rear position lamp installed at the rear of the vehicle, emitting light of stable luminous intensity
3.5.2
category R2
rear position lamp installed at the rear of the vehicle, emitting light of variable luminous intensity
3.6
end-outline marker lamp
lamp installed at a position as close as possible to the outer edge and roof of the vehicle, indicating the width of the vehicle
[Source: GB 4785-2019, 3.9.21]
3.6.1
category RM1
end-outline marker lamp installed at the rear of the vehicle, emitting light of stable luminous intensity
3.6.2
category RM2
end-outline marker lamp installed at the rear of the vehicle, emitting light of variable luminous intensity
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Same type judgment
5 General requirements
6 Requirements for light source
7 Requirements for photometric characteristics
8 Chromaticity requirements for light-signalling devices
9 Test method
10 Inspection rules
11 Implementation of this standard
Annex A (Normative) Particular requirements for front position lamps of category A2
Annex B (Normative) Particular requirements for light-signalling projection function
Annex C (Normative) Minimum range of photometric angle
Annex D (Normative) Distribution of luminous intensity
