AC power to LEDs

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  • #20288

    Hi there,

    I am going to br running 9 of the candle flicker LEDs in parallel using AC power via a household outlet. I know I am going to need to use a transformer but I am not sure what voltage I need. Also, do I need resistors on each of the LEDs? Iam using 9 of the following LEDs


    Color: Yellow
    Peak Wavelength: 590 nm
    Package: Round 3 mm
    Lens type: Milky-white
    Viewing angle: 50 degrees
    Intensity: 900 mCd typ. at 20 mA
    DC forward current: 30 mA
    Forward voltage (typical): 2.1 V
    Lead-free (RoHS compliant)
    Manufacturer: Betlux Electronics
    Manufacturer part number: BL-L314UYW-B-S3


    Lenore Edman

    First, do not hook them directly to AC! You will need to use an AC to DC converter. It is most efficient to start with a low voltage, something like 3 V if you can find it, but likely 4.5 V or 5 V will be easier to find. Yes, you will need to use current limiting resistors for each of the LEDs. You can read about how to determine the resistor value here:

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