Market news and warnings
LED headlight bulbs and the MOT: what changes on 14 October 2026
For years, swapping halogen headlight bulbs for LEDs meant an MOT fail. From 14 October 2026 that changes for one kind of bulb: ECE approved LED replacement (LEDr) bulbs, fitted with their approval sticker on the car. Here is what passes, what still fails, and what to look for on a used car.
The short answer
What changes on 14 October 2026
DVSA has told MOT testers that retrofitted, ECE approved LED replacement bulbs in halogen headlamp units can now pass, as long as there is an approval sticker on the vehicle. The change is written into section 4.14 of the MOT testing manual (compliance with requirements) from 14 October 2026.
- Bulbs: only LED replacement light sources approved under UN Regulation 37, marked LEDr.
- Proof: a secure approval sticker supplied in the packaging by the bulb maker, fixed permanently to the vehicle.
- Where: somewhere the tester can see easily. DVSA gives inside the engine bay as an example.
- Vehicles: class 3 (three-wheelers), class 4 (cars and light vans), class 5 (larger passenger vehicles) and class 7 (goods vehicles from 3,000kg to 3,500kg).
Why LED conversions failed before
A halogen headlamp is approved as a whole: the reflector or projector is designed around the exact position of a filament. Put a different light source in it and the beam pattern can change, throwing light into the eyes of oncoming drivers. That is why the MOT has long treated LED or HID bulbs in a halogen unit as a mismatch.
The rule did not change because LED bulbs became acceptable in general. It changed because a new kind of bulb now exists. Since 2022, UN Regulation 37 has allowed LED replacement bulbs (LEDr) that are tested to behave like the halogen bulb they replace, in any lamp built for that halogen bulb. The problem for testers was proof: an approved LEDr bulb and an unapproved kit look much the same once fitted. Before this change, testers had no practical way to tell them apart, so every LED conversion failed as "light source and lamp not compatible". The sticker fixes that.
The LEDr approval sticker
Each maker designs its own sticker, but it has to carry the same details. Here is an example for an approved H11 LEDr bulb:
What an LEDr approval sticker shows
| Field | Example | What the tester checks |
|---|---|---|
| Type | H11 LEDr | The bulb category matches the halogen bulb the headlamp was made for |
| Variant | 64211DWNBSM-ECE | The maker's part number for the approved product |
| Voltage | 12V | Matches the vehicle's system |
| Approval number | ECE R37 E1 2123 | An R37 approval, with the E mark of the approving country (E1 is Germany) |
| Manufacturer | OSRAM | Who made and approved the bulb |
Pass or fail: common set-ups
How common headlight set-ups are treated at the MOT from 14 October 2026
| Set-up | Likely MOT result |
|---|---|
| Halogen bulbs in halogen headlamps | Pass, if working and aimed correctly |
| Approved LEDr bulbs in halogen headlamps, sticker on the car | Can pass, if the beam and aim are right |
| Approved LEDr bulbs, no sticker on the car | Fail: light source and lamp not compatible |
| Plug-in LED kit with no LEDr approval | Fail: light source and lamp not compatible |
| HID or xenon kit in a halogen headlamp | Fail: light source and lamp not compatible |
| LED headlamps fitted by the car maker | Pass, if working and aimed correctly |
| LED conversion on a vehicle first used before 1 April 1986 | Not treated as a mismatch; beam, colour and aim still tested |
A pass is never automatic. The headlamp still has to light, show the right colour, have a correct beam pattern and be aimed so it does not dazzle. An approved bulb in a cracked, hazy or badly aimed unit can still fail on those items.
Which bulbs are approved so far
Not many yet. The first LEDr bulbs approved under UN Regulation 37 were H11, a type used in many fog lamps and some dipped beams. Bulb makers have said more categories will follow in stages: other fog lamp types first, then high beam types, with the most common headlight bulbs, H1, H4 and H7, expected from around 2028.
That matters because most LED "H7" and "H4" bulbs sold online today are not LEDr approved, whatever the listing says. "Road legal", "CANbus" or "E-marked" on a box is not the same as an R37 LEDr approval with a sticker. If there is no sticker in the box, assume it will fail.
Fitting approved LEDr bulbs properly
- Check the LEDr category on the box matches the halogen bulb your headlamp takes.
- Fit the bulbs as the maker says, so the light source sits where the filament did.
- Stick the approval sticker on the car, somewhere easy to see, such as inside the engine bay.
- Have the headlamp aim checked after fitting.
- Tell your insurer if you are unsure whether they count it as a modification.
Buying a used car with LED headlights
Plenty of used cars carry LED bulbs a previous owner fitted from an online listing. From 14 October 2026 a seller can no longer say "LEDs fail the MOT anyway", and a buyer can no longer assume they are fine. Look under the bonnet for the approval sticker. No sticker, and the car will need halogen bulbs refitted before its next MOT.
The MOT history shows how earlier testers saw it. A past failure or advisory for "light source and lamp not compatible" usually means the car had an LED or HID conversion on that test. It is a cheap fix, but it also tells you how the car was looked after.
Check a car's MOT history
Sources
- Regulations around LED replacement (LEDr) headlamps are changingDriver and Vehicle Standards Agency (DVSA) MOT bulletin
- MOT inspection manual: cars and passenger vehicles, section 4 lampsDVSA, GOV.UK
- Universally legal LED bulbs for halogen headlampsDriving Vision News
FAQ
Are LED headlight bulbs legal in the UK from October 2026?
Some are. From 14 October 2026 an MOT tester can pass an LED bulb fitted in a halogen headlamp if it is an ECE approved LED replacement (LEDr) bulb and its approval sticker is fixed to the car where the tester can see it. Unapproved LED kits still fail.
Will my LED headlight bulbs fail the MOT?
If they are ordinary plug-in LED bulbs with no UN Regulation 37 LEDr approval and no sticker on the car, yes. The tester records them as a light source and lamp that are not compatible, which is a major defect. Approved LEDr bulbs with the sticker on show can pass.
What does the LEDr approval sticker show?
The bulb type with the LEDr marking (for example H11 LEDr), the manufacturer's variant or part number, the voltage, the ECE R37 approval number with its E mark, and the manufacturer. Designs differ between brands, but those details must all be there.
Where does the LEDr sticker go?
On the vehicle, permanently, somewhere the MOT tester can easily see it. DVSA gives inside the engine bay as an example. The sticker comes in the box with the bulbs, so keep it and fit it when you fit the bulbs.
Can I buy legal LED H7 or H4 bulbs yet?
Not as approved LEDr bulbs at the time of writing. H11 was the first category approved, and manufacturers expect fog lamp types next, high beam types after that, and H1, H4 and H7 from around 2028. Until a bulb is LEDr approved and comes with a sticker, it will still fail.
Which vehicles does the new MOT rule cover?
Class 3 (three-wheelers), class 4 (cars and light vans), class 5 (larger passenger vehicles) and class 7 (goods vehicles from 3,000kg to 3,500kg). The change goes into section 4.14 of the MOT testing manual from 14 October 2026.
Do classic cars need an approved LED bulb?
Vehicles first used before 1 April 1986 are not required to have E marked headlamps, so DVSA does not treat an LED conversion on those as a mismatch in the same way. The beam still has to be the right colour, aimed correctly and not dazzle other drivers.