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Old 02-07-2012, 06:21 PM   #1
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Projector Fog Lights Question

The factory fog lights in my PT Cruiser have gotten blasted with road debris and the reflector plating has peeled off so they basically do nothing. So I went shopping on EBay to see if I could get new ones.

I wound up ordering a set of Halo Projector fog lights that are a drop in replacement. They have a heavy weight plastic frame that fits the opening in the front facia and uses the stock mounting holes. The actual light is a die cast metal housing with glass lenses and has a connector to plug into the factory harness. The are also adjustable in the frame. All in all a decent looking set for the money.

My question is I removed the bulbs to see what they are (H3) and noticed that there was a half moon piece of metal mounted inside on the bottom half, is that correct? I would expect that to be on the top half to keep the light low. There is a drain hole in the housing that points down so it appears the lights are mounted in the frame correctly.

Anyone have experience that can shed some light?

FWIW, I wired one to the battery and held it in the fog light location and they through much more light than the factory lights ever did.


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Old 02-07-2012, 10:51 PM   #2
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I got some projectors from autozone that had the same thing inside them. I think that might be what causes that cut off on the projectors.
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Old 02-10-2012, 03:35 PM   #3
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The shade, as it is referred to, is supposed to be on the bottom.

I did a little research and the shape of the reflector in a projector produces an inverted image. That is the light hitting the bottom of he reflector would be projected out the top of the lens. So to create the sharp cutoff of a fog light the shade is placed at the bottom at the focal point to block light from going through the top of the lens.

Some projector headlights actually have the ability to move the shade out of the way to create a high and low beam.
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Old 02-10-2012, 03:56 PM   #4
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Projecters work like the lens in your eye...or a magnifying glass...it inverts the image..... So the cutoff would be on the bottom behind the lense to project blocked light on top to prevent blinding oncoming traffic....
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