How many Ann Arbor city workers does it take to screw in a light bulb? Soon, none. Instead, they will be installing light-emitting diodes, or LEDs, to replace about 1,400 street lights. The eco-friendly city about 30 miles west of Detroit says it will be the nation’s first to convert all downtown street lights to LED technology, which uses less … Continue reading Ann Arbor to Replace Lights With LEDs