GB 25991-2010Automotive headlamps with LED light sources and/or LED modules (English PDF)

5.1 General requirements

5.1.1 LED headlamp shall be so designed and manufactured that under

normal conditions of use, even if subjected to vibration, it can still comply with

the requirements and comply with the provisions of this standard.

5.1.2 LED headlamps shall have good heat dissipation, to prevent heat

accumulation of LED light source. LED headlamp can work normally even in

low temperature freezing environment.

5.1.3 LED headlamps shall have good electromagnetic compatibility.

5.1.4 When the headlamp is equipped with LED light source or LED module,

its performance shall comply with the requirements of this standard; when the

LED headlamp is equipped with filament lamps or HID light source to achieve

high beam or low beam function, its light distribution performance and testing

shall comply with the requirements of their respective standards.

5.1.5 The headlamps shall have beam adjustment device. When the low beam

and high beam form a combination AND each has an LED light source/module,

filament lamp (or combination lamp), the adjustment device shall be able to

adjust them individually, BUT these requirements do not apply to the headlamp

for which the high beam and low beam cannot be adjusted separately.

5.1.6 LED headlamps shall include the following markings.

- LED headlamp

- Voltage;

- Reference center.

5.2 General requirements of LED module and electronic light source

controller

5.2.1 LED module shall use the LED light source which emits visible light, AND

it is not allowed to use other forms of light.

5.2.2 LED module under normal conditions of use, shall be maintained at a

good working condition without design and manufacturing defects, AND the

entire module shall be deemed as failure when there is a LED light source

damage.

5.2.3 LED on the LED module shall be mounted on a suitable fixed substrate,

AND the fixed substrate shall have good strength and stability to protect the

LED and LED module.

5.2.4 LED module (in the lamp) shall be positioned accurately and fixed well, to

prevent the movement.

5.2.5 For the replaceable LED module, in case of replacement, it shall use the

LED module complying with the design requirements; AND the LED modules

of different specifications in the same lamp shall not be interchangeable.

5.2.6 Regardless of the electronic light source controller placed inside or

outside, it is considered as part of LED headlamps.

5.2.7 If not specified by the manufacturer, the LED module shall be tested in

the headlamp submitted by the manufacturer.

5.3 Light distribution

5.3.1 The headlamp low beam shall have enough lighting BUT shall not

produce dazzling, AND the high beam shall have good lighting. Bend lighting

can be achieved by means of an additional light source which is part of a low

beam headlamp. If the additional light source fails, the light distribution shall

still comply with the low beam requirements.

5.3.2 The light distribution shall be measured on a vertical plane light

distribution screen 25 m away from the reference center of the headlamp. The

positions of the test points and zones are as shown in Figure 1.

Unit in millimeter

Figure 1 -- Light distribution screen

5.3.3 Low beam light distribution requirements

5.3.3.1 On the light distribution screen, the low beam shall have a clear cut-off

line with the horizontal part to the left of the v-v line AND the HV-H2-H3 line or

the HV-H1-H2-H4 line to the right. It is allowed to have multiple cut-off lines

visually visible.

Illumination limit on the light distribution screen shall be consistent with the

provisions of Table 1.

Road centreline

Zone I

Zone IV

Zone II

Zone III

Area A

Area B

Table 1

5.3.3.2 For LED headlamps, the illumination limits of test points 1 to 8 on light

distribution screens shall comply with the following requirements.

- Test point 1 + 2 + 3 >= 0.3 lx;

- Test point 4 + 5 + 6 >= 0.6 lx;

- 0.7 lx >= test point 7 >= 0.1 lx;

- 0.7 lx >= test point 8 >= 0.2 lx,

5.3.3.3 As for the LED headlamps with adjustable reflectors, each position of

use of the reflector as specified by the manufacturer shall comply with the

requirements of 5.3.3.1 and 5.3.3.2.

5.3.3.4 There shall be no change in lateral illumination that affects good

visibility in zones I, II, III and IV.

5.3.3.5 If the bend lighting beam is obtained by the following methods, the

requirements in the above Table 1 are also applicable to the headlamps which

are designed to generate bend lighting beam.

- Rotating the low beam or moving the cutoff line transition horizontally;

- Moving one or more optical components of the headlamp...

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