Updating streetlights to use light-emitting diodes makes sense. LEDs are one of the most energy-efficient lighting technologies that currently exist, according to the U.S. Department of Energy.

Faulty LED streetlights have been turning purple for years across America. As the lights fail, many are replaced. That has led to years of purple streetlights that seemingly appear and then ...

High pressure sodium streetlights emit a warm, amber colored light. "These LEDs are inappropriate," Newman said. "They’re way too bright.” Since last summer, nearly all of the old lamps on ...