(1) Effect of LED Traffic Warning Signs chip quality on brightness attenuation
The lifespan of LED Traffic Warning Signs mainly depends on the quality of the chip. Like other light sources, the brightness of LED will gradually decrease with the increase of working time, especially in the field of white LED. Different LEDs are manufactured, and their quality is uneven, and the price varies greatly. Therefore, it is very important to determine the quality of LEDs for the manufacture of transportation products.
The advantage of high-quality LED Traffic Warning Signs is that the service life is very long, and the service life can reach 100,000 hours. If calculated on a 24-hour basis, an electro-optic sign with a high-quality white LED light source can be used for nearly 10 years. After 10 years of work Brightness can still reach 45% of the original.
When selecting LED Traffic Warning Signs suppliers, you should be very cautious. After a long period of performance testing, you must determine the suppliers with high brightness, low light decay, stability, and consistency of parameters in batches.
(2) The influence of the driving circuit on the brightness attenuation of LED Traffic Warning Signs
The LED must work in a constant current state in order to ensure the long life of the LED and the consistency of brightness and chromaticity. 1. LED is a semiconductor device with sensitive characteristics. If the current flowing through the LED exceeds its rated current, the brightness and color of the LED will change immediately, and its life will rapidly decay or even burn out.
2. Obtain the expected brightness requirements and ensure the consistency of brightness and chromaticity of each LED. 3. It can effectively avoid lightning strikes, power grid surges, over-current, and over-voltage protection.
To ensure the long life and high efficiency of LED Traffic Warning Signs, the requirements for its driving power are almost harsh. Unlike ordinary incandescent bulbs, LEDs can be directly connected to 220V AC mains. LED is driven by a low voltage of 2-3 volts, and a conversion circuit must be designed. LED Traffic Warning Signs products for different purposes must be equipped with different power adapters. In the international market, foreign customers have very high requirements on the efficiency conversion, effective power, constant current accuracy, power supply life, and electromagnetic compatibility of LED drive power supplies. To design a good power supply, these factors must be considered comprehensively, because the power supply is used in the entire LED Traffic. The role in Warning Signs products is as important as the human heart.
(3) The operating temperature has a great influence on the life of LED Traffic Warning Signs, and if it is not handled properly, it will affect the life of LED.
The heat dissipation of LED Traffic Warning Signs is very important, and the luminous efficiency of LED decreases with the increase of LED temperature. Although the electro-optical signs use low-power LEDs, the heat generated by multiple LEDs can not be ignored if they are combined to work for a long time. When designing and manufacturing electro-optic signs, fully combine the electrical and physical characteristics of LEDs, and rationally design the structure of the product. The LED array is evenly distributed on both sides of the light guide plate, and the frame is made of aluminum alloy I-shaped grooves, which can not only effectively dissipate heat for LED Traffic Warning Signs, but also enhance the mechanical strength of the signboard, and provide support for fixing the signboard. The casing of the drive power supply is also made of aluminum alloy, which can be placed on the sign board or fixed on the wall. These are good heat treatment measures.
Combining active and passive lighting, it can still function in the event of a circuit failure.
Reflective film has been familiar to the majority of people. The traditional reflective film itself is opaque. At present, the transparent reflective film has begun to be used. The light can penetrate the reflective film itself from the back of the reflective film, and the light does not have a large attenuation. In this way, patterns can be printed on the reflective film as the surface of the electro-optic sign, so that when the line fails, the electro-optic sign can still play a warning role.
The combination of active luminescence and passive reflection is the ideal working method for tunnel electro-optical signs. Installation and application Emergency indication signs should be set on the upper part of the emergency, and the installation height clearance of Traffic Warning Signs should not be less than 2.5m. The fire-fighting equipment indication signs should be set above the fire hydrants, and the installation height clearance should not be greater than 2.5m. The indicator signs of the pedestrian crossing shall be installed on the top of the pedestrian crossing, and the clearance of the installation height shall not be greater than 2.5m. The driving cross hole indicator sign should be set at the driving cross hole on the left side of the driving direction, and the installation height clearance should not be less than 2.5m.
Traffic Warning Signs of the emergency parking belt should be set about 5m in front of the emergency parking belt, and the installation height clearance should not be less than 2.5m.
Evacuation instructions Traffic Warning Signs should be set on the side wall of the tunnel, the installation height clearance should not be greater than 1.3m, and the spacing should not be greater than 50m.
When installing, pay attention to the bracket form of the photoelectric Traffic Warning Signs, because the wind load of the vehicle is large, the fixation is not firm, and the sign is easy to fall off. The suspended sign should be supported by a triangle as much as possible, and where the power line should be drawn is also very important. It is advisable to be easy to install.
