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Thread: Rebel, LedEngin Forward Voltages/Amperages (For Resistor Calculations)

  1. #11

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    Working on making a nice hot pink LED for the wife, and this electrical math STILL befuddles me.

    RBGW 10W LED

    7.4 Source voltage
    2.77 diode forward voltage
    1000 diode forward current (mA)
    =================================
    4.7 Watt capable or greater 4.7 ohm resistor

    So if i'm reading the correct, i would apply this to BOTH the red and blue LEDs, then add another 5ohms to the blue resistor? I'm not exactly seeing 10-ohm resistors in the TCSS shop... help!

  2. #12

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    So if I'm reading this right, I would be able to run two rebel greens (off a GGW triple-rebel) in serial on a 7.4V battery pack and still have good battery life? Whereas you wouldn't be able to that with a LEDengin LED.

    Is that right?
    "We don't have to win. We only have to fight." - Mace Windu (Shatterpoint)

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