As LED Streetlights Spread, Some Critics Look for Dimmer Switch

Cities around the world are replacing old streetlights with energy-efficient LEDs. Not everyone is happy about it. Streetlights that use light-emitting diodes have a lot of appeal. They require roughly 50% less energy than the common high-pressure sodium and metal-halide lamps. And they last much longer, resulting in big cost savings. But some concerns have arisen about the LEDs most commonly used in streetlights.