What are differences between sodium-vapor street lamps and mercury street lamps?

There are both high pressure sodium and high pressure mercury street lamps before. What are their differences?

Sodium-vapor street lamps and mercury street lamps are different in brightness, energy consumption, and color temperature.

  • Brightness: Sodium street lamps provide light with higher brightness and color temperature. The mercury lamps are dimmer.
  • Energy consumption: To reach the same brightness, the mercury lamps need more power than the sodium lights.
  • Color temperature: The color temperature of the mercury street lamps is higher than that of the sodium vapor street lamps. Therefore, the sodium vapor street lamps are always yellow, while the mercury ones are whiter.

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

What Others Are Asking

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?

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