u/SteelAtom_

Mercury Vapor

Mercury Vapor [SEE UPDATE] public streetlight I saw yesterday. Could anybody please identify the model? My city is quickly replacing every old streetlight :( The new LEDs are a bit annoying, but I completely understand why they're necessary.

UPDATE: Quote from Wikipedia, "Unsaturated high-pressure sodium lamps exhibit a different failure at the end of life. Since all the sodium-amalgam is vaporized, there is no voltage rise, so these lamps don't cycle at their end of life. When all the sodium is consumed, the lamp operates with a greenish color of the mercury vapor discharge."

u/SteelAtom_ — 6 days ago