Originally Posted by SubLGT
Have you ever seen objective, photometric measurements for a sizable number of HID or LED retrofits into halogen housings, anywhere?
Yes.
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There was a recent SAE paper looking at LED retrofits (around 6 samples ,IIRC).
It was 9 samples in 3 different lamps, one projector and two reflectors. Two of the lamps were of the VOL type, and one reflector was of the VOR type.
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Mostly what I see on forums and from sellers of kits is photographs of headlights shining on a wall. A very effective marketing tool, but reveals very little about real world performance. The "headlight-shining-on-a-wall" test is about as informative as the "drop-of-oil-on-white-paper" test.
If I showed up and said "this specific HID retrofit projector is worse than a 1970s sealed beam" with no data I'd be laughed out the room and presented with pictures of how "well" it performs. Good thing I came with data.
Originally Posted by Spktyr
Originally Posted by Dave_Mark
Jeep Wrangler (LED) is in the tables above.
IIRC, that one is actually an aftermarket unit that Fiat slapped in there. Sure, technically OEM, but not really.
It's made by Magna, which is a T1 supplier of vehicle lighting products, and an OEM for FCA.
https://www.magna.com/company/company-information/customers
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Same thing goes for the Harley Davidson LED units.
Those are made by JW Speaker, which is an American company that makes excellent LED products.