In recent years, in order to maintain the sustainable and healthy development of the national economy, the state has increased investment in infrastructure construction, such as the construction of railways and highways. The demand for tunnel lights is increasing. In order to save energy, protect the environment, improve the quality of tunnel lighting, but also in order to adapt to the sustainable development of tunnel operation and management, combined with the special lighting environment and vision of the tunnel, it is necessary to find a reasonable new lighting theory and skill light source.

1 Conventional tunnel light and LED tunnel light function comparison selection

At present, most tunnel lighting uses high-pressure sodium lamps as a light source, but high-pressure sodium lamps have many shortcomings in the form of radiation, color rendering, visual sensitivity, power specifications, brightness control, etc., and the emerging LED tunnel lighting lamps with their excellent performance, especially the controllability of brightness, overcome many shortcomings of high-pressure sodium lamps. It is becoming the mainstream of tunnel lighting in the world today. The state has also introduced a new initiative of “ten cities ten thousand” semiconductor lighting project, which has brought unprecedented opportunities for the development of LED tunnel lights.

LED(Light Emitting Diode) is a semiconductor light-emitting technology. The first developed LED can only emit red light, which is used for indicators in electronic devices. With the development of technology, now LED lights have been able to emit a variety of colors of light, and widely used in a variety of industries, the main application markets include traditional display and signal lamp market, backlight market, street lamps, tunnel lights, automotive lighting market, outdoor landscape lighting and interior decoration lighting market, special lighting market. LED as a tunnel light source has its unique advantages.

(1)LED tunnel light has low power consumption and energy saving, and its energy consumption is saved by more than 40% compared with traditional high-pressure sodium lamps.

(2)LED tunnel lamp has a long life, in an ideal state of 100,000 h, while the life of high-pressure sodium lamps and fluorescent tubes is only 10,000 to 30,000 h.

(3)LED tunnel lights have high reliability, low daily maintenance and repair costs, and the average trouble-free working time (MTBF) is as high as 20,000 h, while the average trouble-free working time (MTBF) of high-pressure sodium lamps and fluorescent tubes is less than 10,000 h.

(4) Reduce the construction cost of the distribution system (cable, transformer, distribution box, bridge, etc.), for long tunnels, long-distance power supply, cable, distribution facilities accounted for a particularly large proportion of the cost, the use of LED tunnel lights due to power saving can greatly reduce the investment in cable and distribution equipment.

(5)LED tunnel lights can achieve instant start, easy brightness adjustment, with no stabs, wide starting voltage range and other advantages, can achieve a variety of energy-saving ways, such as according to the road, tunnel traffic flow intelligent adjustment of illumination.

(6) High-pressure sodium lamps, fluorescent lamps, electrodeless lamps contain mercury, lead and other chemical pollutants, and LED tunnel light source does not contain chemical polluting substances, is a green light source.