The City Of Lewiston

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Light-Emitting Diode
Overview
Cities across Idaho are installing energy-saving LED (light-emitting diode) traffic signal lights. LED traffic signals are long-lasting, energy-efficient lights that can be easily installed in the existing signal head structure.

While producing highly visible light, LEDs consume 80 to 90 percent less energy than incandescent signals. LED traffic and pedestrian signals generally use 9 - 25 watts, compared to the 75 - 150 watts used by an incandescent signal. Because traffic signals operate 24 hours a day, 365 days a year, the opportunity for savings is huge.

In addition to saving energy, LED signals also can reduce re-lamping cycles of maintenance. This is because LEDs generally last five to seven years, compared to just one year for an incandescent light signal.The City has installed 367 LED energy saving red lamps in traffic signals. The green and "Don't Walk" indications will be replaced as funding allows. To date, 49 amber, 283 green, and 218 "Don't Walk" have been replaced.