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LED question

Discussion in 'Home Cinema Building DIY' started by Darren Blake, Oct 7, 2003.

  1. Darren Blake

    Darren Blake
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    Not really AV, but here goes anyway...

    I want to squeeze as much brightness out of an LED as I can. The LED I have chosen has its nominal brightness (5cd) quoted at 20mA, but has a maximum forward current (If) rating of 50mA.

    My question is this: Is the max If figure for a constant current or only for a short time? How would the life of the LED be affected if I ran it constantly at, say, 75% of its max If value?

    TIA,
     
  2. The Hemulen

    The Hemulen
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    As far as I know the max If rating should be continuous. LED's will take a good deal more pulsed but I wouldn't imagine this was a pulse rating being quoted.
    Keep to a single limiting resistor per led to be safe if running them hard.
    By the way, I'm not sure you'll get 50% more perceived brightness running them 50% higher current.
    I'd give it a go and see what happens. Led's are fairly cheap after all...
     

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