High Pressure Sodium Lamps

"Most street lighting comes in the form of high pressure sodium lamps, which produce the most amount of light for the least amount of electricity required to power them. The way it works is that the lamps have a quantity of sodium in them, and when electricity is passed through the sodium it gets excited and gives off an orange glow."

Picture of HPS street light 1[upload.wikimedia.org]
Picture of HPS street light 2[upload.wikimedia.org]
Picture of HPS street light 3[upload.wikimedia.org]

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