From torch to LED lamp to explore the history and future of tunnel lighting

As one of the human traffic modes, the tunnel is an underground space composed of a semi enclosed structure. Because of its special structure, the tunnel can not direct sunlight, lighting during the day also need. Lighting system is one of the most important facilities in modern tunnel engineering, and the lighting system is in a long-term state when it is put into use. The origin of tunnel can be traced back to the spring and Autumn period, the Qin was the world's first man-made "Baoxie road tunnel". Historical records: "Cloud Road Trinidad, Tung Shuhan, that the world is afraid of qin." The tunnel lighting at that time was made of torches, very simple and very inconvenient. In modern time, with the development of industrialization, the tunnel traffic gradually increased, tunnel lighting is developing gradually. In the middle of nineteenth Century, tunnel lighting kerosene, gas lamps, until the end of nineteenth Century, and gradually applied to the tunnel lighting lamp. Baoxie Road site simple tunnel lighting era in the last century at the beginning of 90s, China's little tunnel tunnel lighting facilities, not to mention, the highway tunnel is mostly no lighting or just hanging a few street lights, lighting quality is very low, the tunnel lighting to meet the lighting needs only stay in simple. At present, with the continuous innovation of technology, development of tunnel lighting industry has made great progress. Even in the simple lighting era, the tunnel lighting source has undergone the development process from incandescent lamp, fluorescent lamp, high pressure mercury lamp, low pressure sodium lamp and high pressure sodium lamp. The light source of tunnel illumination breaks through in aspects of light efficiency, luminous flux, life, light color and color rendering, thus creating a better tunnel lighting environment. Since intelligent tunnel lighting era in twenty-first Century, the development of LED lighting technology is becoming more and more strong, LED lighting gradually occupy most of the market of tunnel lighting. LED light source with high luminous efficiency, color characteristics coefficient is high, long service life, high efficiency, low power consumption, and the LED lamp with dimming function is perfect, can be changed at any time according to the tunnel lighting level of day and night and the volume of traffic and other factors, through the integration of WiFi and ZigBee network technology, LED lighting in the era of intelligent lighting for tunnel lighting. In 2007, LED domestic road tunnel lighting market began to form. The first 5 years, many manufacturers ignored because of heat issues of LED lighting, LED Road, had caused tunnel lighting project failure rate as high as 90% or more, misleading LED lighting technology "is not mature enough to be the development trend of" wait-and-see opinion. But at the same time, Shanghai think twice, with its own unique heat dissipation, lighting layout and other technologies, completed the development of 148 LED Road, tunnel lighting projects, the provision of 250 thousand large power LED lamps are all running stable. Among them, China's first LED tunnel lighting project - Jiangxi King Eagle high tunnel LED lighting project, was named the national energy-saving emission reduction demonstration project of Ministry of communications; also used Shanghai Sansi LED lighting project - Fujian Nan Hui highway tunnel, by the development and Reform Commission, Ministry of finance, the Ministry of transport as a national demonstration of highway tunnel LED lighting engineering. Jiangxi King Eagle high tunnel in southern Fujian Hui highway tunnel tunnel lighting intelligent control system in different sections according to the lighting requirements, the tunnel lighting illumination distribution reasonable, but also supports a variety of intelligent dimming methods, such as: the lights as the tunnel lighting, depending on the brightness near the entrance and exit of the lamp should be closer to normal outdoor light, from both ends to the middle gradually decline, in order to reduce the "black hole, white hole effect, improve the traffic safety; while according to the time, season, weather and automatically adjust the brightness to the appropriate position of the function, the lighting system built in different scene modes, to realize the intelligent management, to ensure traffic safety. In this regard, Shanghai think over the construction of the "Shaanxi oak tunnel" intelligent lighting project, was named "national demonstration project". Shaanxi Zhaxiao tunnel in addition, large scale tunnel engineering project LED application products in Shanghai think twice and the intelligent control system is applied to Yunnan highway tunnel, Chongqing Zhangjiashan tunnel and Hunan Liangshuijing tunnel, Shanghai road tunnel in Dalian, Beijing Chengde, Yunnan Pu Xuan highway tunnel, G85 Chongqing and Kunming high-speed line Ma Chao the Hong Kong Zhuhai Macao Bridge Tunnel and deep tunnel completed or under construction. In recent years, with the city to speed up the process, people pay more and more attention to road traffic safety and comfort, the tunnel lighting intelligent control technology have become increasingly demanding; and with the continuous development of new technology, tunnel lighting intelligent control technology will be "more energy-efficient, more comprehensive and more comfortable" direction.