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As per the title, here is a fact sheet I received from DVSA.
In short, light emitters above 2000 lumens need headlamp power wash and active levelling control. If anyone wishes to read it verbatim, here it is.

Thank you for your enquiry of 31 October regards changing your cars headlamps.



Unfortunately, this is complicated.



If you fit HID or LED headlamps they must meet the same fitment requirements as for vehicle type approval. This means that the vehicle must have an automatic self-adjusting system (either the headlamps or suspension).



If they are HID they must also have headlamp cleaning, whereas, if they are LED they only need headlamp cleaning if the lamps are over 2000 lumens.



I have attached a DfT Fact sheet regarding HID headlamps which explains the legal rationale. At the time it was written, LED headlamps were still a thing of the future, but apart from the markings and the 2000 lumen limit for headlamp cleaning, the same principals apply.



Best regards

Shaun Martin | Policy Specialist (MOT Testing Service)



------------Information Sheet------------
May 2010

Aftermarket HID Headlamps Statement This document provides general guidance and advice on the legislative requirements in Great Britain relating to aftermarket HID headlamps. Every effort has been made to ensure that it is factually correct but recipients should check with the producers of this document if they have reason to believe any part is not correct or is now out of date. General requirements In the Department for Transport's (DfT) view it is not legal to sell or use after market HID lighting kits, for converting conventional Halogen headlamps to HID Xenon. If a customer wants to convert his vehicle to Xenon HID he must purchase completely new Xenon HID headlamps. The reason for this is that the existing lens and reflector are designed around a Halogen filament bulb, working to very precise tolerances. If one places a HID "burner" (bulb) in the headlamp, the beam pattern will not be correct, there will be glare in some places and not enough light in other places within the beam pattern. The following is the legal rationale: The Road Vehicle Lighting Regulations 1989 regulate the situation in the UK. Under these Regulations, HID/Gas Discharge/Xenon headlamps are not mentioned and therefore they are not permitted according to the strict letter of the law. However new vehicles have HID headlamps. This is because they comply with European type approval regulations. The UK cannot refuse to register a vehicle with a European type approval. These approvals relate to ECE Regulation 98 (for the HID headlamps which are tested on a rig in a laboratory) and ECE Regulation 48 (lighting installation on the vehicle). For the aftermarket, a used vehicle cannot obtain type approval because this only applies to new vehicles. However DfT does not think it reasonable simply to ban HID in the aftermarket. Instead the Department makes analogies with new vehicles. It seems reasonable to require HID in the aftermarket to meet the same safety standards as those for new vehicles. The same level of safety should apply.

 

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As far as the MOT goes, headlight washers are only tested on cars registered from September 2009.
Self-Levelling is only checked "if fitted". It isn't a failure to not have it.
 

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I believe the 25W xenon lamps on the Giulia and Stelvio do not need washers but the 35W lamps do.
 

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I believe the 25W xenon lamps on the Giulia and Stelvio do not need washers but the 35W lamps do.
Yes that's correct.
Which likely means you don't want the 25W versions!
 

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Maybe it's a good thing I just got my GT MOT'ed, it's got cheapo EBay HIDs DIY fitted by myself. So at least I've got another year to think about it.

Most likely I'll switch back to standard halogens by then.
 

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Maybe it's a good thing I just got my GT MOT'ed, it's got cheapo EBay HIDs DIY fitted by myself. So at least I've got another year to think about it.

Most likely I'll switch back to standard halogens by then.
This isn't a recent reg change.
So if you passed this year, there is a good chance it will pass next year.

The only recent change is to not check pre Sept 2009 headlight washers at the MOT anymore.
 

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That's a relief, the standard GT dipped beams are poor enough to be a danger to the user. The HIDs have been a life saver (literally - I'm pretty sure).

I think it varies between test centres just how stringent they can be over the lights: the two places I've used over the last few years have been fine with them as they are but I've read of some on here who had to remove them.
 

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I think it varies between test centres just how stringent they can be over the lights: the two places I've used over the last few years have been fine with them as they are but I've read of some on here who had to remove them.
If you’ve got a well defined beam shape and the level is correct, you’ll likely be fine.
 
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