High Power RGB LED Lamp

Discussion in 'The Projects Forum' started by rappa, Aug 14, 2010.

  1. rappa

    Thread Starter Member

    Nov 17, 2008
    For some time I've wanted to build a high power RGB LED lamp but powering them can get tricky and/or expensive, with constant current drivers. I think I finally have all the ingredients but wanted to get a sanity check before I order.

    1. CPU heatsink (approx 4"x4") for LEDs.
    2. RGB LEDs: I'd like to use 3 or 4 of these: http://cgi.ebay.com/3W-RGB-LED-Full...81451423?pt=LH_DefaultDomain_0#ht_2119wt_1139
    3. V-infinity VLD24-350 drivers, one per color: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=102-1899-ND
    4. A 18-24V notebook power supply.
    5. DC DC step down converter for Arduino (5V). Not sure what component is best.
    6. Arduino for PWM control

    It seems that Vin will need to be 4x(LED Vdrop) + 4v for this chip. Total amps will be 1.05. So for a max Vdrop of 3.8 (blue) I need at least a 19.2V power supply that can supply ove 1.05A. Or 15.4V if I go with 3 LEDs.

    The V-infinity chips have PWM, so will control with Arduino or AVR (is 5V ok? I couldn't find any voltage info on the PWM).

    Am I missing anything? Thanks