SOURCE-LINKED REGULATION GUIDE
UN R31 — Halogen sealed-beam headlamps
Assess the HSB headlamp unit according to its product definition.
Explore the scopeWhat does it cover?
UN R31 concerns approval of halogen sealed-beam (HSB) headlamps for M-, N- and T-category vehicles. An HSB unit combines the reflector, optical system and halogen light source into an inseparable whole; dismantling it renders the unit unusable. This construction distinguishes it from a replaceable light source.
Who is it for?
Specialist headlamp-unit makers and lighting-testing teams.
Which subjects are addressed?
- HSB unit definition
- Inseparable optical assembly
- Halogen light source
- Vehicle categories
Common question
Does HSB mean an ordinary replaceable bulb?
No. The light source, optics and reflector form an inseparable unit. Approval of the light source alone is a different matter.
Source documents and references
Work with this regulation in RegsUP.
Read the text with its edition and sources. Assess available comparisons, relevant dates and question-and-answer features against your work needs.
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