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Light-emitting diode (LED) streetlights strike the best balance between brightness, affordability, and energy savings over their lifespan—from production to disposal—a new bulb comparison shows.

The study, conducted by University of Pittsburgh engineers, coincides with initiatives in several U.S. cities to replace energy-guzzling HPS lamps—known for their flat orange glow—with LEDs. The city of Pittsburgh is considering replacing 40,000 streetlights with LEDs, similar to retrofits and pilot programs under way in several cities, including Los Angeles, San Francisco, Raleigh, and Ann Arbor.

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