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12V 30LED 2W: Choosing Optimal Resistor for Single LED in Car Backlight Window Button

henazari 7281 12
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  • #1 16434431
    henazari
    Level 10  
    Posts: 34
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    Board Language: polish
    Hello,
    I have a plate with 30 LEDs soldered on (very bright, white). The board says 12v 30LED 2W - which resistor should be used to use 1 diode for the car (backlight of the window button, 12v)?
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  • #2 16434475
    SERVICE-AV
    Level 39  
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    Board Language: polish
    You must determine how many of them are in line because certainly not all of them ;)
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  • #3 16434479
    Rezystor240
    Level 42  
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    Board Language: polish
    If you can draw a diagram of how these LEDs are connected.
  • #4 16434500
    henazari
    Level 10  
    Posts: 34
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    Board Language: polish
    12V 30LED 2W: Choosing Optimal Resistor for Single LED in Car Backlight Window Button 12V 30LED 2W: Choosing Optimal Resistor for Single LED in Car Backlight Window Button

    This is how it looks.
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    #5 16434527
    Rezystor240
    Level 42  
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    To power one diode from 12V you will need a 480? / 1/4 W resistor.
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  • #6 16434563
    henazari
    Level 10  
    Posts: 34
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    480 ohm will be hard to find, if I give 500 it will be ok too? What does it mean 1/4 W? - I'm sorry but I'm green in it :D
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    #7 16434568
    Rezystor240
    Level 42  
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    If you use 500? = 0.5K? nothing will happen, it will only shine a little less.
    1/4 W is the resistor power that the power can convert into heat.

    500? can be obtained by connecting two 1K? resistors in parallel.
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    #8 16434577
    WRadek
    Level 23  
    Posts: 408
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    Board Language: polish
    From what I see, it is 3s10p :)
    Don't those diodes burn?
    Measure the current consumed by one 3-diode branch and use the simplest current source instead of resistors. There is no constant voltage in the car. It ranges from 11 to 15. A power source can handle this.
    Read here: http://robotykadlapoczatkujacych.pl/lekcja-10-stabilizatory/
    You can also build a power source on the LM317 and one resistor. For a current of 10mA, a resistance of 120 ohms.
  • #9 16434580
    henazari
    Level 10  
    Posts: 34
    Rate: 8
    Board Language: polish
    Thank you very much for your help, best regards :)

    Added after 3 [minutes]:

    WRadek wrote:
    From what I see, it is 3s10p :)
    Don't those diodes burn?
    Measure the current consumed by one 3-diode branch and use the simplest current source instead of resistors. There is no constant voltage in the car. It ranges from 11 to 15. A power source can handle this.
    Read here: http://robotykadlapoczatkujacych.pl/lekcja-10-stabilizatory/
    You can also build a power source on the LM317 and one resistor. For a current of 10mA, a resistance of 120 ohms.


    Unfortunately, the button has very little space and I do not want to combine with such miracles, I hope that the resistor alone can do it :) So far none of the diodes has burned out - 3s10p is the "name" of these diodes?
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    #10 16434604
    Rezystor240
    Level 42  
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    henazari wrote:
    that the resistor alone can do it


    Sure he can do it.
    This is just a single low power diode.
    The limited resistor current will not burn.
    The current source is good with frequent voltage changes and more than a few diodes or one larger.
  • #11 16436746
    WRadek
    Level 23  
    Posts: 408
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    Board Language: polish
    No no.
    3s - 3 series
    10p - 10 parallel
    3szeregowo10rownolegle.
    At least that's how I read it from the pictures.
  • #12 16436764
    Rezystor240
    Level 42  
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    WRadek wrote:
    No no.
    3s - 3 series
    10p - 10 parallel
    3szeregowo10rownolegle.
    At least that's how I read it from the pictures.


    And what does this have to do with the subject?
  • #13 16457487
    WRadek
    Level 23  
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    This is the answer to one of the author's questions. Asked in the thread, not answering the topic, only to another question of the author.
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Topic summary

✨ The discussion revolves around selecting an appropriate resistor for powering a single LED from a 12V source in a car backlight application. The user has a board with 30 LEDs rated at 12V and 2W and seeks advice on the resistor value needed for one LED. Responses suggest that a 480 ohm resistor is ideal, but a 500 ohm resistor can also be used without significant issues. The power rating of the resistor should be at least 1/4 W. Additional insights include the configuration of the LEDs (3 series, 10 parallel) and the importance of considering voltage fluctuations in a car environment. Some participants recommend using a current source for better performance under varying voltage conditions, while others confirm that a simple resistor will suffice for a single low-power LED.
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