LEDs: A Promising Energy-Saving Light Source for Road Lighting

Rising demand with diminishing reserves of oil and gas spread the energy crisis all over the world. Renewable energy and efficiency technology are the keys to resolve the energy crisis. As the improvement in luminous efficacy, LEDs have been an energy-saving choice for general illumination and road lighting. This paper made a comparison between LEDs system and HPS system for road lighting to evaluate which one is more energy efficient and discussed some factors may influence the efficiency of LEDs system and HPS system, such as mesopic vision, dimming, color of illumination. Though the difference in total luminaire efficacy was not that much in favor of the LEDs, LEDs show a promising prospect in the near future because of the dramatic improvement in luminous efficacy.