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  • Bad design

    posted by WInzigM on 10/13/2009
    0

    Involvement:Expert (understands the inner workings) - Ownership:more than 1 month

    Pros:

    Nice cheap led decorations.

    Cons:

    I switched the lights to continuos lighting without blinking and after few hours insulatiou on many leds with resistors melted.
    So i did same measured leads are powered by 230V from and resistors 1k9 are used to reduce U.
    In red yellow blue color string is power loss on rezistors p=0,42W on green leds p = 0.47W but used resistor are designed for P=0.25W and without insulation. So when leas are continuosly swithed on rezistors became really hot and insulation is damaged.

    OtherThoughts:

    I bought 2 string lights and, second piece haven't problem with isulation.
    Most likely because different resistors were used 1k (instead of 2k) = it means that the power loss on resistor is most likely below 0.25W.

    Bottomline:

    This is really dangerous - xmass decoration. Led's are powered directly by 230V And when the insulation is melted you can get pretty big shock(last shock in your life).

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