AC street lights receive alternating current directly from a municipal power grid. In China, roadway systems commonly use 220–240V AC at 50Hz, although project specifications may differ. Inside the fixture, a driver rectifies AC into controlled DC for the LED modules. It also regulates current, limits heat, and protects against voltage fluctuations.
The International Energy Agency reports that lighting uses about 15% of global electricity consumption. This explains why efficient street lighting receives strong public investment. The U.S. Department of Energy notes that LED streetlights can reduce energy use by roughly 50–70% compared with conventional technologies, depending on design and operating conditions. The real result depends on optics, mounting height, dimming schedules, and road classification.
A reliable AC fixture needs surge protection, thermal management, and stable power-factor performance.
Photocells or network controls can dim lights after midnight, when traffic declines. Small details matter. A poorly matched driver may cause flicker, premature failure, or unnecessary maintenance.
I have also seen specifications focus heavily on wattage while ignoring glare and uniformity. That is a mistake. A lower-wattage lamp is not automatically a better road light. Buyers should review test reports, LM-79 or equivalent photometric data, ingress protection, warranty terms, and independent performance records before comparing suppliers.
