The LED products used in the transportation field mainly include red, green, and yellow signal indication, digital time display, and arrow indication. The product requires bright ambient light during the day and lower brightness at night to avoid glare. The light source of the LED traffic signal command light is composed of multiple LEDs. When designing the light source, multiple focal points must be considered, and there are certain requirements for the installation of LEDs. If the installation is inconsistent, it will affect the uniformity of the light efficiency of the light emitting surface. It is necessary to consider how to avoid such defects in the design. If the optical design is too simple and the light distribution of the signal is mainly guaranteed by the perspective of the LED itself, then the requirements on the light distribution of the LED itself and the installation requirements are strict, otherwise This phenomenon will be very obvious.

The LED traffic signal is also different from other signal devices (such as the headlights of a car) in the light distribution. The requirements for car headlights on the cut-off line are more stringent. The design of automobile headlamps only needs to arrange enough light to the corresponding place, without having to consider where the light is emitted. The designer can design the light distribution area of the lens in small areas, but the traffic signal also needs to take into account The uniformity of the light effect on the entire luminous surface must meet the requirements of clear signal patterns and uniform visual effects when observing the signal luminous surface from any working area used by the signal machine. Although the incandescent and tungsten halogen light source signal lamps emit light stably and uniformly, they have the disadvantages of high energy consumption, low life, easy to produce phantom signal display, and easy to fade color films. If it can reduce the phenomenon of LED dead lights and reduce light attenuation, the application of high-brightness, low-energy-consumption LEDs in signal machines will bring revolutionary changes to signal machine products. The LED products used in the transportation field mainly include red, green, and yellow signal indication, digital time display, and arrow indication. The product requires bright ambient light during the day and lower brightness at night to avoid glare. The light source of the LED traffic signal command light is composed of multiple LEDs. When designing the light source, multiple focal points must be considered, and there are certain requirements for the installation of LEDs. If the installation is inconsistent, it will affect the uniformity of the light efficiency of the light emitting surface. It is necessary to consider how to avoid such defects in the design. If the optical design is too simple and the light distribution of the signal is mainly guaranteed by the perspective of the LED itself, then the requirements on the light distribution of the LED itself and the installation requirements are strict, otherwise This phenomenon will be very obvious.