What type of light bulbs are in street lights?

Street lights typically use high-intensity discharge (HID) bulbs, such as metal halide or high-pressure sodium bulbs, due to their brightness and efficiency. In recent years, many municipalities have switched to LED (light-emitting diode) bulbs, which offer longer lifespans, lower energy consumption, and reduced maintenance costs. The choice of bulb often depends on factors like cost, energy efficiency, and the desired level of illumination.