LED Tail lights - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 11-12-2005, 06:45 PM Thread Starter
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LED Tail lights

When I was driving home from The Houston GTG I saw an Infinity with LED tail lights and I thought to myself maybe I can do the samething to my car, that way i won't have to worry about replacing the bulbs.

I have a 1984 300D W123

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post #2 of 3 (permalink) Old 11-13-2005, 10:36 AM
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RE: LED Tail lights

It may or may not work. Why? Will it can burn out your relay. So I advise you check the relay as it get hot. Somone did once and it did work but the relay burn out.
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post #3 of 3 (permalink) Old 11-13-2005, 11:22 AM
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RE: LED Tail lights

If you want a funcional solution its really not all that easy. Light bulb fixtures have a reflector socket combination that places the light emitting filiment at the focal point of the reflector to redirect the light coming off the back and sides of the filiment into a beam pointing generally outwards from the reflector. From there the light passes through a lens that redirects the light in a controlled pattern towards the following drivers line of sight unless it is one of the newer "clear lens cover " type of fixtures where the reflector is also designed to do the job of the dispersion lens as well.

Most aftermarket LED replacement lights cannot match the light output of a light bulb and the LED's are usually mounted on a light bulb base with the light emitters facing outwards. LED's have their own optical properties and are usually made with a wide angle dispersion lens or a narrow directional beam lens as part of the actual LED itself.

This is what causes the aftermarket lights to fail in providing proper light output. The reflector in the OEM fixture is useless since each LED has its own reflector of sorts and already shapes it output through its own internal lens. When that light hits the lens array of the OEM fixture it is further broken up and the light output from the fixture in no way matches the dispersion pattern it was designed to have.

If you are lucky enough to have the clear lens type of tail light or one of the older type of fixtures where the dispersion lens was seperate from a clear tinted lens cover, and can be removed leaving just the tinted outer lens cover you can use hi-brightness LED's aimed out through the clear non optically corrected part of the lens to correctly put the light from an array of LED's where its supposed to go.

Most OEM LED fixtures use "Luxeon" type LED's as their light source because they are the only ones bright enough to provide enough light without resorting to the cheap looking fifty led arrays found on the newer DeVilles.


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