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rgb led specs & control

Discussion in 'LEDs and Optoelectronics' started by camilozk, Oct 19, 2016.

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  1. camilozk

    camilozk

    116
    4
    Apr 20, 2014
    Hi!

    I bought some 3W RGB Leds, and I dont finish to understand their specifications:

    product link: http://www.ebay.com/itm/1-100pcs-x-...hash=item33a6775a97:m:m7spR0mf9AScVUfLSqRkjRQ

    Specifications:

    LED Emitter: 3W RGB (Red,Green,Blue)
    Lumens: RED:25-35LM,GREEN:40-50LM,BLUE:25-35LM
    DC Forward Voltage (VF) : RED:2.3-2.6V,GREEN:3.4-3.8V,BLUE:3.4-3.8V
    DC Forward Currect (IF) : 350-1000mA
    Wavelength: RED:620-650NM,GREEN:520-530NM,BLUE:465-475NM
    Beam Angle: 120 degrees
    LifeSpan Time : > 50,000 hours


    is it possible that the forward current for each led goes from 350 to 1000mA?


    I would like to control their intensity using PWM with arduino, but I am not sure what to use for this. I´ve read that a mosfet is appropiate for this application, but I never used one, and I wouldnt know how to choose one for these leds.

    Some guidance would be lovely.

    have a nice day!
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,291
    2,731
    Jan 21, 2010
    Check the resource on driving LEDs. If you have any more questions, please ask.
     
  3. Audioguru

    Audioguru

    2,726
    615
    Sep 24, 2016
    ebay, the person selling the cheap Chinese LEDs and the manufacturer do not know anything about electronics.
    Forward current has an absolute maximum value, above which causes meltdown, it might be 1000mA. The 350mA rating might be what they recommend for a long life if it has good cooling. Or maybe 350mA is the absolute maximum for one color on an LED and 1000mA is the maximum when all three colors have 333mA each on one LED. Who knows??

    The ad says, "very low heat generating" but 3W is a lot of heat and they should recommend the size of a required heatsink.

    There is a lot of guessing when you buy ebay junk.
     
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