With the rapid development of the national economy, China's dramatic increase in the number of cars has led to the worsening of road congestion. Major cities have built underground transportation (subway) to alleviate traffic congestion. Metros operate underground throughout the year, which has a high demand for lighting. It not only requires energy-saving, high brightness, and a long lifespan but also has to ensure uninterrupted illumination.

At present, the commonly used incandescent lamps, fluorescent lamps, and high-pressure sodium lamps, etc. are mainly supplied by the AC mains. The optimum designed AC grid could not get rid of the power outage. To ensure uninterrupted underground lighting, it typically must be installed with a rectifier, battery, inverter, and other components to work as emergency lighting power. When the power supply is normal, AC passes the rectifier and becomes DC to charge the battery; when the power grid is interrupted, the battery changes the DC to AC through the inverter and powers the lightings. This kind of continuous lighting system is very high in cost. Meanwhile, after several transformations, power consumption is also large.

In recent years, semiconductor lighting powered by DC current (LED) has obtained rapid development. This lighting is 90% more energy-saving than incandescent lights. Under the same power, the light intensity of the LED light is 40 % higher than the ordinary fluorescent lamp and high-pressure sodium lamp. And the lifespan of an LED lamp can reach up to l0 million hours. The color rendering index is 80 or more, far higher than the high-pressure sodium lamps. Because it uses DC constant current power supply, strobes do not occur on LED lights. Explosion-proof led exit signs https://www.eneltec-led.com/led-explosion-proof-lights/led-explosion-proof-exit-lights.html

Therefore, LED has become the best green lighting. Each subway station using LED lights not only saves a lot of electricity and a lot of copper but also saves a lot of maintenance costs. Meanwhile, it can also ensure the quality of lighting. Aiming at the problems existed in the current subway system, provides a subway lighting solution with a novel structure, low cost, long lifespan, better energy-saving effect, and high reliability. best led headlights http://bestledheadlight.com/