DX  » Community » Reviews » Multi-color RGB 180-LED Christmas/Decoration String Lights (18-Meter/220V AC)
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  • Overall Rating: 4
  • Price: 5
  • Quality: 2
  • Ease Of Use: 5
  • Usefulness: 5
Bad design – Multi-color RGB 180-LED Christmas/Decoration String Lights (18-Meter/220V AC) Reviews

posted by WInzigM on 10/13/2009 Certified Owner

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

Nice cheap led decorations.
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.
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.
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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