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MOT rule change January 2021 - HID and LED headlight bulbs in halogen light units


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See revised MOT rule effective from 11th January 2021.

4. Lamps, reflectors and electrical equipment

4.1.4 Headlamps - Compliance with requirements - Changed sentence from 'Existing halogen headlamp units should not be converted to be used with HID bulbs. If such a conversion has been done, you must fail the headlamp.' to 'Existing halogen headlamp units should not be converted to be used with high intensity discharge (HID) or light emitting diode (LED) bulbs. If such a conversion has been done, you must fail the headlamp.'

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I thought that had been the mot rules for the last 5 years or so

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5 minutes ago, Rosgoe said:

I thought that had been the mot rules for the last 5 years or so

Was for HIDs not for LEDs

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DVSA have made a slight amendment to the above effectiveness ve from 22nd March 2021 - which now applies to all vehicles built and used on and after 1st April 1986

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LED's have much lower power draw and run colder, so are not likely to overheat the headlamp.

Do you know the reason why LED's added?  

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Presumably if a headlight unit is designed for a particular type of bulb, in this case halogen, using another type of bulb may produce a less well controlled light pattern and cause issues for other motorists as regards glare, etc.

Nothing to do with the amount of power drawn or the possibility of overheating.

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