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

Do LED street lights reduce light pollution?

When the high pressure sodium lights prevailed in the city, they said that the night sky is polluted because of the scattered light. Will LED street lights reduce the pollution?

Why are most of the street lights post-top?

I have seen many street lights that are post-top. But it is also possible to hang the lamp on some steel cables between the buildings or use the outreach arm. Why aren’t the other ways popular?

How are the street lights arranged?

I am curious about the way street lights are arranged. Is it regulated by the government, or is it designed by software?

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