Why do the HPS street lights have to cool down before I turn them back on?

I want to buy a HPS street light, but the company says that I have to wait for one minute for it to cool down before I turn it on again. Why?

High-pressure sodium lamps are high-intensity gas discharge lamps. When the lamp is first extinguished, the internal temperature is very high, resulting in high vapor pressure. While the pulse voltage of the starting device cannot exceed 5,000 volts for safety reasons, it cannot reach the breakdown voltage required for starting at this time. Therefore, the lamp cannot be started when it is hot and must wait until it cools down.

More reading: LED Street Lights VS HPS Street Lights: What’s Better in 2023?

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