sodium street light

How Many Kilowatts Does A Street Light Use?

A high-pressure sodium street light can draw up to 1000 watts, and an incandescent light used in the 1900s needed 320 watts. Some LED street lights require only 73 watts and, according to the U. S. Department of Energy, produce a higher quality of light.

The high-power LED street lamp comprises a lamp body, at least one set of LED light source and a heat dissipating component thereof, and is used for a metal PCB board connected with the LED light source line. The metal PCB board is fixed on the lamp body, and at least one hole is disposed thereon, the LED heat sink is installed in the hole, the main body of the LED heat sink is a metal cylinder, and the bottom is a disk shape, and is fixed on the inner surface of the rear part of the lamp body. An LED light source is connected to the top of the LED heat sink. The high-power LED street lamp of the invention has the advantages of good heat dissipation effect, reliable operation, simple optical path design and easy assembly.

Fluorescent bulbs were used in street lights from the 1950s to the 1970s, but because of their low reliability and size, they gave way to high-pressure sodium lights rated at 250 watts. A metal halide street light draws 400 watts and gives true, white light. Mercury vapor lights also appeared in the 1950s, with 100-watt bulbs used in street lights, but were banned in 2008.

Most of us take for granted the fact that we can easily find our way outdoors at night. It’s hard to believe that prior to the introduction of electric streetlights in the late 1870s, this task was far more difficult and dangerous.

The earliest electric streetlights were illuminated by arc lamps. Arc lamps contained two carbon rods that, when touching, completed an electric circuit. When the rods were pulled apart, the current continued to flow across the gap in an arc that created light.

By 1912, arc lamps had become obsolete thanks to the invention of incandescent streetlights, which had a longer lamp life and were easier to maintain. Incandescent lights were suspended on poles that curved into a “gooseneck” shape that resembles today’s streetlights. Similar to modern incandescent lights, these gas-filled streetlights contained coiled tungsten that glowed when heated by the current passing through it.

In time, many incandescent streetlights were replaced by fluorescent ones. Fluorescent lights produced cool white light that allowed for excellent color rendition. Their other advantages included high luminous efficiency and long lamp life. Fluorescent streetlights were popular during the mid 1950s up until the 1970s when they began to be replaced by high pressure sodium and metal halide sources of lighting. The latter two remain the most commonly municipal and industrial lighting sources today.

Different streetlights consume different amounts of energy. Incandescent lamps typically range from 25-150 watts, fluorescent lamps range from 18-95, metal halide lamps range from 50-400 watts, and high pressure sodium lamps range from 50-400 watts.

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