In addition to high-power LEDs in automotive lighting, lighting, LCD backlights, LED street lights and other high-value-added products, and can obtain considerable profits. However, with the arrival of old-fashioned ordinary traffic lights and the lack of matured led signal lights in previous years, the new high-bright three-color LED traffic light guides have been widely used. In fact, a complete set of high-performance LED traffic light is very expensive, but due to the important role of traffic lights in urban traffic, a large number of traffic lights need to be updated every year, leading to a comparison. Large markets, after all, high profits are also conducive to the development of LED production and design companies, and will also have a benign stimulus for the entire LED industry.

The LED products used in the transportation field mainly include red, green and yellow signal indications, digital timing display, and arrow indication. When the product requires high intensity ambient light during the day, it should be bright, and the brightness should be reduced at night to avoid glare. The light source of the LED traffic signal is composed of a plurality of LEDs. When designing the light source, multiple focal points must be considered, and there are certain requirements for the installation of the LED. If the installation is inconsistent, the light effect uniformity of the light-emitting surface will be affected. In the design, we must consider how to avoid such defects. If the optical design is too simple, the light distribution of the signal light is mainly guaranteed by the angle of view of the LED itself, then the requirements for the light distribution of the LED itself and the installation requirements are strict, otherwise The phenomenon will be very obvious.

LED traffic lights are also different from other signal lights (such as car headlights) when distributing light, although there is a requirement for light intensity distribution. The requirements for automotive headlamps on the optical cut-off line are more stringent. The design of the car headlights requires only enough light to be placed in the corresponding place, regardless of where the light is emitted. The designer can design the lens's light distribution area in small sections, but the traffic lights need to take care of the whole. The uniformity of the luminous effect of the illuminating surface must be such that when the signal illuminating surface is observed from any working area used by the signal lamp, the pattern of the signal needs to be clear and the visual effect needs to be uniform. Although the incandescent lamp and the tungsten halogen lamp light source are stable and uniform in illumination, they have defects such as high energy consumption, low life, easy generation of phantom signal display, and fading of color chips. If the LED dead light phenomenon can be reduced and the light decay is reduced, the application of high-brightness and low-energy LED on the signal light will definitely bring revolutionary changes to the signal light product.

The application of LED in the transportation field mainly includes the following aspects:
First, traffic lights. LED signal lights are favored by urban traffic management departments for their high brightness, high reliability, low cost of use, and long life.
Second, the highway traffic guidance system. With the improvement of highway construction standards, the LED traffic guidance system has become a standard configuration product, and the market demand is large.
Third, urban road traffic guidance, signs. With the increasing traffic congestion in major and medium-sized cities, road traffic-induced LEDs are showing rapid growth in various cities.