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Message: <blockquote data-quote="DarkMatter" data-source="post: 1826207" data-attributes="member: 50339">That makes sense. Check this out for some detail.[GALLERY=media, 116276]Spectral_responses2 by DarkMatter posted Nov 12, 2016 at 2:20 PM[/GALLERY][GALLERY=media, 116277]Figure_13_web by DarkMatter posted Nov 12, 2016 at 2:20 PM[/GALLERY]As you can see the halogen produces lots of the light in a range we can't see, and as heat. HID is very well matched to human vision but very peaky. And LED can be quite well matched in which light it produces as compared to what we see. It still won't hit the optics ideally. That the cutoff survives suggests these headlights might be a decent match to a retrofit. I'd still go HID on preference myself. Your car, your choice.</blockquote>