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Pls help decode

Discussion in 'General Electronics Discussion' started by bazzel, Nov 10, 2011.

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  1. bazzel


    Nov 10, 2011
    Hi, I am a new hobbyist. Im trying to get my head around the numbers and values of components.
    The only numbers I have for my LED s are:RED
    65mcd 2.1Vf

    What do these numbers mean?

    Also, I ve googled "reading a datasheet" but have not come across quite what Im looking for. Does any one have any recomendations?
  2. BobK


    Jan 5, 2010
    65mcd = 65 millicandella, is the light output.
    2.1Vf is the forward voltage. The voltage drop across the LED when at operating current.
    Ifmax = 15mA is the max forward current.

    So, the operating characterisctis of this LED are the it will draw 15ma when the voltage across it is 2.1V and will put out 65mcd of light.

    To read datasheets you are going to have to have a lot of basic electronic knowledge. There are many books and tutorials available. Where to start depends on what you already know and what your plans are.

    To learn more about LEDs try this stick thread:

  3. OLIVE2222


    Oct 2, 2011
    Hi bazzel,

    mcd stand for micro candela, see
    2.1Vf The V stand for Volts and the f for forward. ist's the used voltage

    Ifmax I is the electric current used, here 15mA = 15 milli amperes

    So it's give the light brightness under defined conditions.
  4. OLIVE2222


    Oct 2, 2011
    good damned I am still to slow to wrote my posts ! Yep and m stand for milli not micro
    Last edited: Nov 10, 2011
  5. bazzel


    Nov 10, 2011
    Cheers for the replys
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