Put this one in the “didn’t see that coming” bin. Virtually everywhere you drive these days chances are you will see one or more LED traffic lights at important intersections. They’re the ones that look like a pattern of bright dots.
Cities around the country have installed these new traffic lights for several very good reasons. They are very energy-efficient using about 90% less energy than their incandescent counterparts and, more importantly, they last tens of thousands of hours, thus saving municipalities a bundle in maintenance costs.
Wisconsin, for example, which has put LED traffic lights at hundreds of intersections, saves about $750,000 per year in energy costs. LEDs installed seven years ago are still burning, while most incandescent bulbs have to be replaced every 12 to 18 months.
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According to Lutron Electronics, Inc., one of the most reputable lighting control companies in the world, dimming incandescent, 
LEDs do not contain any mercury, which makes them less toxic and, therefore, a safer light source to dispose of than 3 of the most ubiquitous light sources used in the world – 
Light emitting diodes, or LEDs, are becoming increasingly popular and more high-quality LED lighting products are being manufactured and sold in the marketplace. 
Replacing the five most frequently used light fixtures in your home, or the light bulbs in them, with ENERGY STAR qualified ones could save you about $60 each year in energy costs.