Road lighting was originally used to ignite wood, and then gradually developed into the use of oil lamps, gas, arc lamp, carbon filament incandescent lamp, LED Street Light high-pressure mercury lamps, the mainstream source of road lighting is high-pressure sodium lamp.
Based on the global energy conservation and emission reduction policy, some new energy-saving sources (such as LVD electrodeless lamps and LED lights) have been gradually applied to road lighting projects and developed rapidly.
In 1558, the streets of Paris were fitted with a container of turpentine or wood, which lit the pine gum or wood light when it was dark. In the winter of 1667, LED Street Light instead of using oil lamps in some streets in 1806, the Baltimore City street was illuminated with gas. In 1842, an arc lamp appeared in Paris, and soon the lights were applied to the streets for 1878 of years, and British J.W. Swan first proposed the use of carbon filament lamps.
In the 1932, the Dutchman began lighting the streets with low pressure sodium lamps. A high-pressure mercury lamp was invented in 1935. 1965, high-pressure sodium lamp came out and used for road lighting. China was the first to install 10 kerosene lamps on Nanjing Road in Shanghai in 1865, and 10 electric arc lamps were installed in Waitan, Shanghai in 1882, and Shanghai began to use incandescent lamps in the streets in 1890.
At present, LED Street Light in addition to the use of lights along the road in the city and in some highways or large traffic on the highway on the production of useful continuous lighting, due to economic benefits, the general highway is not the use of continuous lighting.
The driver in the night is the use of obstacles and the road as a background of the brightness of the two contrast to detect the road ahead there is no obstruction.
The average brightness of the road is increased, the light contrast of the necessary light of the obstacle is smaller, the brightness of the object, pedestrian and so on that the obstacle is easy to be discovered, if the light is darker than the background, the driver can only see the outline, that is, to identify the contour.
During the driving process, the driver only cares if there are no pedestrians or obstructions in front of it. So the road is just to make the road with a certain brightness, increase the brightness of the object and road, so that the driver can be identified by the outline of the person or things can be. If the brightness of the object is greater than the road surface brightness, the driver in the darker background can see a bright object, that is, the inverse contour identification.
On the road, LED Street Light the diversion of traffic island, need to be easy to identify the driver, so increase its surface brightness, so that it can be reversed contour identification. The driver can only recognize the detail of the side surface when the object is brighter on one side of the line of sight. To improve the driver’s ability to identify the details, can increase the surface brightness of the object or change the brightness by road illumination.
Urban roads are the arteries of the city, LED Street Light and the main lighting is the street lamp, which can meet the pedestrian and vehicle night operation. Garden lights, landscape lights and street lamps form three-dimensional lighting mode, enhance road decorative effect, beautify the city night scene, can also make up for the lack of illumination.