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They would have to be certified for the V.W factory build to be road legal and carry the approval stamp on the lens. If you want to be road legal you would need to source EOS OE Xenons and other associated parts such as headlight washers and trim stabilisers. Many try the aftermarket (Chinese) led conversions but they vary in quality, performance and reliability.
 

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They would have to be certified for the V.W factory build to be road legal and carry the approval stamp on the lens. If you want to be road legal you would need to source EOS OE Xenons and other associated parts such as headlight washers and trim stabilisers. Many try the aftermarket (Chinese) led conversions but they vary in quality, performance and reliability.
OP is from the US, so none of those restrictions apply. We can run any headlights we want, in any configuration we want.
 

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There are some states, like Pennsylvania that do have restrictions on headlights.
 

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Some states still have a vehicle inspection as a part of annual license renewal. In theory they are supposed to look for DOT approved lighting, but admittedly the lighting part of the inspection is rarely done to that level. So, it’s possible that an aftermarket lighting assembly “could” result in an inspection failure. In addition some states prohibit LED light bars while driving on road. These are both in play here in NC.
 

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Some states still have a vehicle inspection as a part of annual license renewal. In theory they are supposed to look for DOT approved lighting, but admittedly the lighting part of the inspection is rarely done to that level. So, it’s possible that an aftermarket lighting assembly “could” result in an inspection failure. In addition some states prohibit LED light bars while driving on road. These are both in play here in NC.
Ah a inspection for DOT stamps, thats a weird one, but I guess its a possibility. Not sure what LED light bars have to do with the headlights though, but it does not surprise me that light bars are prohibited.
 

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The law didn't state that you can't use aftermarket headlights, but it does set a brightness limit and that the light needs to be white. 10k Bulbs won't cut it. And the brightness can be checked. PA uses safety inspections similar to UK MOT. Some states and municipalities have no rules or enforcement at all.
 

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The law didn't state that you can't use aftermarket headlights, but it does set a brightness limit and that the light needs to be white. 10k Bulbs won't cut it. And the brightness can be checked. PA uses safety inspections similar to UK MOT. Some states and municipalities have no rules or enforcement at all.
35 watt HID retrofit with 4300-5500 kelvin will pass those requirements. Can't imagine why anyone would want 10,000k color as its more or less useless (and purple)
 

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The rules on headlights can be very restricive and confusing. E.G if you have a HID conversion driving in France you are supposed to have a spare bulb and easily replace it. You can do this with genuine OE HID because they are plug in bulbs. But aftermarket HID kits use modified H7 bases with the capsule and wiring harness grafted on. Not so easy to comply with the 'easy to replace' rule. Leds should be easier to swap, but cooling them is harder than for the glass envelope of a 35W HID bulb. The headlamp housing is designed to run a 55W halogen bulb and a 35W HID will run cooler in the same housing.

Has anybody looked at how the OE manufacturers are fitting their approved led headlights on new cars and how they cool them? If they are designing from scratch I would expect them to make thermal contact with the reflector or housing if it's metal to avoid fans.
 
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