The application of LED in the field of transportation mainly includes the following aspects:
1. Traffic lights. LED lights are favored by urban traffic management departments for their high brightness, high reliability, low use cost and long life.
2. Highway traffic guidance system. With the improvement of highway construction level, LED traffic guidance system has become a standard configuration product, and the market demand is large.
Iii. Urban road traffic guidance and signs. With the increasingly serious traffic congestion in large and medium-sized cities, road traffic induced LED displays are growing rapidly in various cities.
The application advantages of LED in signal lights are as follows:
1, monochromatic light, with divergence Angle
Leds emit monochromatic light, so there is no need for color sheets to produce red, yellow, and green signal colors; The light emitted by leds is directional and diverges at a certain Angle, thus eliminating the aspherical reflectors used in conventional signal lights. This feature of LED solves the phantom (commonly known as false display) and color fading problems of traditional signal lights, and improves light efficiency.
2, cold light source, low energy consumption
The advantage of LED light source in energy saving is very obvious, one of its remarkable characteristics is low energy consumption, which is very meaningful for the application of lamps.
3, good reliability, long life
The working environment of the signal lamp is relatively harsh, cold and hot summer, sun and rain, so the reliability of the lamp is higher. The average life of general lamp incandescent bulb is 1000h, the average life of low pressure tungsten halogen bulb is 2000h, resulting in high maintenance costs. In practice, many LED traffic lights have been used for more than 5 years, and the LED has not been damaged. Another big advantage is that the response time is faster than that of halogen tungsten bulbs, so as to reduce the occurrence of accidents.