Description : What is the difference in the color of the light from a High Pressure sodium vapor streetlight and a Low Pressure sodium vapor streetlight?
Last Answer : Here are some links: https://www.stouchlighting.com/blog/led-vs-hps-lps-high-and-low-pressure-sodium https://www.bulbamerica.com/blogs/news/15932364-in-the-spot-light-4-low-pressure-versus-high-pressure-sodium-lamps Seems HPS might have other elements inside to make the light less sodium yellow.