LED light panel help?

Discussion in 'The Projects Forum' started by hawkins990, Sep 27, 2012.

  1. hawkins990

    Thread Starter New Member

    Sep 26, 2012
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    I am getting a 100w led driver with 32 - 36v output, 500 red diodes, wavelength 660nm with forward voltage of 2.0 - 2.2 and forward current of 20ma. I know that I can use an led calculator to determine what size resistor and wiring diagram but how do I know how many LEDs I need to use 100w?
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    um is it a crappy chinese "constant current" driver... I bet it is...
    please post a link or specs to the driver.
     
  3. hawkins990

    Thread Starter New Member

    Sep 26, 2012
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  4. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
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    You need 2381 LEDs (100W / (2.1V X 20mA)). If you use that constant current supply with only 500 LEDs, you'll have to waste 79% of the available power heating resistors!
     
    Last edited: Sep 28, 2012
  5. hawkins990

    Thread Starter New Member

    Sep 26, 2012
    3
    0
    Thank you for the help! Wow 2000 eh? That's a lot of soldering haha
     
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