Christmas lights

If you are going to buy some decorative LED lights for Christmas that are battery powered, especially the Poundland type of lights, you might want to check whether they have mounted a small resistor within the circuit as part of the manufacturing process.

In my case, I bought some “Metal Lights” from Poundland which did not come with a resistor mounted inside the circuit. You can greatly extend battery life if you solder a small resistor on one of the wires yourself, e.g. a 100 Ohm one.

I only had 150 Ohm resistors at hand, so that’s what I ended up soldering in.

Poundland's Metal Lights with an added resistor by Luigi Di Fraia

Poundland’s Metal Lights with an added resistor

We’re probably talking about days of  continued usage before the batteries wear off once a resistor is added, although the drawback is that the lights will be slightly dimmer.

About Luigi Di Fraia

I am a Senior DevOps Engineer so I get to work with the latest technologies and open-source software. However, in my private time I enjoy retro-computing.
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2 Responses to Christmas lights

  1. e5froge5frog says:

    … or save on batteries and hook up a “wall wart”.

  2. luigidifraia says:

    Update: this setup has been running 24h/day for 18 days in a row 🙂
    I eventually turned the lights off after the holiday season ended.

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