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Led from Mercedes headlight

Discussion in 'LEDs and Optoelectronics' started by Leds, Feb 10, 2018.

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  1. Leds

    Leds

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    Feb 10, 2018
    Hello!
    I had a spare headlight from my mercedes laying around and decided to take it apart. I took the powerfull led out.The problem is that I don't know what voltage I will have to connect to which contacts on the connector. Can someone pleas help me? I took some pictures and used a multimeter to make a scematic of al the connections.
     

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  2. Externet

    Externet

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    Aug 24, 2009
    Get the vehicle wiring diagram to check if there is a power module driving the LED. That power module will be mandatory to use and fed by the 12V battery.
     
  3. Leds

    Leds

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    Feb 10, 2018
    I don't think the power module will work for me. It has about 40 in/output pins. So that is bit to difficult I think.
     
  4. Externet

    Externet

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    Aug 24, 2009
    Well, difficult is one thing; proper is another.
    You can try feeding each led emitter with a current limited voltage source to the emission level of satisfaction under the smoking point.
     
    Arouse1973 likes this.
  5. Leds

    Leds

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    Feb 10, 2018
    That is what my plan already was, but than still which contactpoint is negative and which is positive? And what voltage should I hook up?
     
  6. Externet

    Externet

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    Aug 24, 2009
    I would try first briefly with 2 AAA cells in series for 3V and mark red the + wire at the polarity that turns it on. It may be faint.
    Then the polarity is known.
    Next, depending on the voltage supply you want to use, calculate a series resistor, for which you should have an educated guess of the LEDs data sheet.
    Edit. Magnifying your picture, see 6 emitters per LED. Perhaps the 3v will not be enough. 12V with 2KΩ in series may.
     
    Last edited: Feb 10, 2018
  7. Bluejets

    Bluejets

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    Oct 5, 2014
    One would have to wonder why you would destroy an obviously expensive Mercedes part just to get a couple of LEDs.
     
  8. kellys_eye

    kellys_eye

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    Jun 25, 2010
    ^ :D

    You could check in the car itself and see which wires have power on them when you turn the lights on.
     
  9. Leds

    Leds

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    Feb 10, 2018
    I got the light for free, and it had damage, but it still worked.

    About the 2 AAA's in series to get 3 volt and test the polarity, I tried it with a 3.3 volt power suply with an other led out of the same headlight. So my first try was wrong and the Led was broken. This is my last led so I want to do it with care.
     
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