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. What are the reasons?
  • Tungsten: As the electrode material, tungsten is likely to sputter on the surface of the tube. It is the black coating near the end of the tube.
  • Na: When Na diffuses into the arctube, the tube will get dark. This may occur near the center of the tube, which has the highest temperature.
  • Na outside of the arc tube: If the bulb gets dark, it is likely that Na has leaked from the tube and reacted with the glass, leaving brown stains.

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

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