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Seat Leon Third Brake Light LED Replacement: Identify Correct Diodes & Calculate Values

dmnk 14931 6
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16656259
    dmnk
    Level 10  
    Hello all,

    I would like to replace the led in the third brake light strip in my car. However, I do not know how to determine what LEDs are. I am sending a photo of the leds and the diagram (in the diagram all resistors are 1.5 Ohms). Could someone please tell me what diodes it is and explain how it can be calculated?

    Seat Leon Third Brake Light LED Replacement: Identify Correct Diodes & Calculate Values Seat Leon Third Brake Light LED Replacement: Identify Correct Diodes & Calculate Values
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  • #2 16656269
    Justyniunia
    Level 36  
    It looks like Super Flux LEDs to me. 3mm lens.
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  • #3 16656283
    dmnk
    Level 10  
    Thank you for answering if such a diode will be suitable: link
    And when it comes to diode parameters, is it possible to convert it? What voltage and current? I sat a little on the internet and information on how to choose a resistor for a diode is plenty, but the other way round is not necessary.
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  • #4 16656322
    carrot
    Moderator of Cars  
    I fix such lights by buying a piece of red LED strip in the DIY store and sticking to the factory pcb after desoldering all components from it
  • #5 16656511
    dmnk
    Level 10  
    Well, that's all right, that's how I have it done "at this time" is not the worst solution, but I would prefer to go back to the original. I repeat the question about the calculation of the diode that bothers me a lot, I would like to learn something :)
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  • #6 16656630
    Justyniunia
    Level 36  
    The forward voltage of the diode depends on its color.
    For red it is 2 - 2.2V.
    The current of the standard diode is set at 20mA and a resistor should be selected for such parameters.
    Here, according to the diagram you drew, 120mA output (6x20mA - diodes connected in parallel) and voltage (assuming 2.2V / diode in series) 8.8V.
    The supply voltage in the car installation is max. 14.4V and a resistor should be selected for this voltage.
    The calculators are on the Internet from the "board", as you want to learn, this is the basic law of Ohm (you know the current that flows in the circuit and the voltage to be deposited on the resistor).
    Then the formula for power (resistor) P = UxI
  • #7 19494343
    paskud181
    Level 9  
    Seat Leon Third Brake Light LED Replacement: Identify Correct Diodes & Calculate Values Seat Leon Third Brake Light LED Replacement: Identify Correct Diodes & Calculate Values Seat Leon Third Brake Light LED Replacement: Identify Correct Diodes & Calculate Values Hello, I had a similar replacement of damaged diodes, ended with a mechanic replacing them with a LED strip. It did not work too long, because max 12v can withstand the LED strip and the installation gives 13.6v. I used a voltage stabilizer and everything flickers
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Topic summary

The discussion revolves around replacing the LED in the third brake light of a Seat Leon. The user seeks assistance in identifying the correct diodes and calculating the necessary resistor values. Responses indicate that the LEDs are likely Super Flux type with a forward voltage of 2-2.2V and a standard current of 20mA. A calculation method is provided, emphasizing the use of Ohm's law to determine resistor values based on the total current and supply voltage. Some participants suggest alternative solutions, such as using a red LED strip, but caution about voltage compatibility issues. A user shares their experience with a similar replacement that resulted in flickering due to voltage discrepancies.
Summary generated by the language model.
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