Normalement, new LED street lights are not blue; plutôt, they emit white light. But sometimes they can be blue for the following reasons:
For security
Blue light is more easily perceived by the human eye at night compared to other colors of light. The wavelength of blue light is shorter, and the scattering effect is better. It can better penetrate haze, pluie, et de la neige, reducing the occurrence of traffic accidents.
For high energy efficiency
The energy consumption of blue light is relatively low, and the use of blue LED bulbs can save energy and reduce energy consumption and maintenance costs.
Unified standards
In some areas, the government may choose blue as the standard color in order to unify the color of street lights. This can improve the overall beauty of the city and increase its recognition.
