Will the power consumption of high-pressure sodium lamps increase or decrease after being used for a long time?

The HPS street lights near my home have been used for a long time. Will they consume less energy?

When high-pressure sodium lamps are used for a long time, their power consumption will increase. This is because the evaporation of the filament and the chemical reaction inside the lamp tube will cause the resistance of the lamp to become larger. Then the power consumption will increase. Besides, the brightness of the lamp will dim. The lamp tube and filament need to be replaced regularly.

More reading: Lifespan of The LED Street Lights: How Long Do They Last?

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