The DVSA has issued an official clarification notice to UK testing stations regarding the MOT inspection rules for retrofitted LED replacement light sources (LEDr) in halogen headlamps, formally updating Section 4.1.4 of the inspection manual.
Following the initial policy revision introduced on 14 October 2026, which ended an outright five-year ban on aftermarket LED conversions, the DVSA has moved to clear up lingering ambiguity on the ramp regarding specific headlamp compatibility and historic vehicle rules.
DVSA outlines distinct criteria based on vehicle age
Vehicles first used before 1 April 1986: Light source compatibility with the headlamp unit is not assessed during the MOT test and cannot be used as a reason for rejection. Classic vehicles can continue to utilise retrofit LED bulbs without needing manufacturer approval stickers, provided standard beam image, aim, and cut-off criteria are satisfied.
Vehicles first used on or after 1 April 1986: Existing halogen headlamp units must not be converted with High Intensity Discharge (HID) kits, or an LED replacement light source that has not been specifically approved for use in that lamp.
The DVSA emphasises that an LEDr bulb can only be accepted where the product has been certified for use in that exact halogen headlamp assembly and is supported by a corresponding manufacturer-issued approval sticker displayed visibly on the vehicle.
The update reinforces that generic, unbranded “plug-and-play” LED bulbs purchased online remain an automatic fail under Section 4.14 for light source and lamp incompatibility.
Even where a reputable OE manufacturer produces a UN ECE Regulation 37 compliant bulb, it must be homologated specifically for that vehicle’s lamp application, with the tamper-evident label affixed inside the engine bay.
For workshops carrying out pre-MOT preparation, bulb replacements, or winter vehicle health checks, the guidance remains straightforward: check vehicle application lists before supplying retrofit LEDs, ensure the accompanying sticker is visibly applied to the vehicle bodywork, and confirm the beam image cleanly satisfies the optical aimer.
