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Guide To: ECE R31 - Headlamps - halogen sealed beam (HSB)

23 July 2023

UN ECE R31, or Regulation No. 31 of the Economic Commission for Europe of the United Nations, is a regulation that specifies the requirements for sealed-beam headlamps (SB) for power-driven vehicles and their trailers. These devices are used to provide forward illumination for vehicles.

UN ECE R31 applies to SB that are either stand-alone or built into other light units, such as combination or multi-function lights. The regulation specifies the size, shape, color, and photometric performance of SB. It also specifies the test methods that must be used to verify that SB meet the requirements of the regulation.

UN ECE R31 is recognized by many countries around the world. This means that SB that have been approved under UN ECE R31 can be used on vehicles in these countries.

Here are some of the key requirements of UN ECE R31:

SB must be symmetrical and must have a symmetrical beam pattern. SB must be able to produce a beam pattern that complies with the requirements of UN ECE Regulation No. 48. SB must be able to withstand a certain amount of vibration without deforming. UN ECE R31 is an important regulation that helps to improve the safety of vehicles on the road. By requiring SB to meet certain standards, the regulation helps to ensure that these devices are effective in providing forward illumination for vehicles.

Here are some additional points about UN ECE R31:

SB must be marked with the UN ECE R31 approval number. SB must be installed in a way that ensures that they are aligned correctly. SB must be replaced if they are damaged or become defective.

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