Why do street lights work during a powercut?

When there was a power cut, every light in my house went out, but the street lights outside still worked. Waarom?

The national power supply system includes many levels. The levels of household electricity and the power of street lights are different. The street lights are powered by independent public electricity. Daarom, when there is a power cut, the street lights won’t be influenced.

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Why do the HPS street lights darken?

There are some HPS street lights that have worked for a long time near my home, and I find the lampshades get dark. Wat zijn de redenen?

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