With the continuous development of human needs, the installation of LED displays in public communities has become a beautiful landscape on the street. It not only satisfies the needs of the masses for public transportation, but also landscaping to brighten the appearance of the city. However, when the LED display on the bus stop was erected like a mushroom, the problems such as excessive brightness, frequent flickering, and glare were brought to the attention of some citizens. The brightness is too bright and too dazzling every night, the first light of the Hua Deng, the LED screen advertisement on the bus platform along the Wuhan Avenue is particularly attractive. With the jumping of the lights, various patterns appear from time to time. "The screen is too glaring, and I shed tears." Mr. Fang, who was waiting at the Xudong Village station at Xudong Street, said that due to the glare of the darkness, passengers would choose to turn their heads down or turn to the other side when waiting. “The screen is facing the cab, and when it suddenly turns white, the eyes are very uncomfortable.†For the bus advertising screen on the bus stop, a bus driver also has a lot of opinions. Li Yuanfu, a Shengyuan taxi driver with many years of driving experience, said that especially in the evening, he wanted to see if anyone on the platform took a taxi and the advertising screen flashed and his eyes were involuntarily attracted. Affecting health and endangering safety "The human eye is very sensitive to high-brightness color light." Zeng Qingyan, deputy dean of the Wuhan Aier Eye Hospital and director of the keratology department, said that short-term color jumps are prone to visual blind spots. She said that when the LED screen is dark, the color difference with the surrounding environment is large, and yellow, red and other colored light will make the eyes uncomfortable. Unlike the large-scale advertising LED screens that are hundreds of square meters in the business district, the electronic screen of the bus stop is closer to people, causing more damage to the human eye. Chen Xiao, deputy director of the Department of Ophthalmology, Wuhan General Hospital of Guangzhou Military Region, said that the electronic screen keeps blinking for drivers and pedestrians, and the pupils are not able to contract, which will cause loss of photoreceptor cells in the retina, which may induce or aggravate cataract conditions. If you encounter high-intensity white light stimulation, you may even become blind for a short time, causing a traffic accident. Mao Chaojun, an engineer of Wuhan Jinhuasheng Technology Co., Ltd., has conducted field measurements on many outdoor LED displays in the central city. To achieve better display results, the brightness of LED displays needs to reach 4000 cd/m2 (candela/square meter, which refers to unit area). Luminance brightness). Mao Chaojun said that according to the "Wuhan Outdoor Advertising Signboard Setting Technical Specifications", the outdoor advertising area is between 0.5-2 square meters, and the maximum allowable brightness should not exceed 800 cd/m2. If you follow this standard, these screens are greatly exceeded. The brightness regulations are still blank. For the design of bus stations, the person in charge of the Wuhan Municipal Public Transport Management Office recently said that the construction of bus stops is not invested by the government, but is completely market-oriented, and is invested, constructed, operated and maintained by advertising companies. Currently, stop sign advertising is operated by nearly 10 companies. “Customer requirements are too demanding.†Mao Chaojun said that in order to attract attention, advertisers often require advertisements to “flash, light, jump†during playback, and the LED screen will be brighter and brighter. At present, light pollution is generally divided into three categories in the world, namely, white light pollution, artificial daylight and color light pollution. The installation and playback contents of the LED display are subject to approval and supervision by the relevant departments, but there is no uniform standard for brightness. The relevant person in charge of Wuhan Urban Management Bureau also said that the brightness standard of Wuhan LED display is indeed blank. The "Wuhan Outdoor Advertising Signboard Setting Technical Specification" promulgated in 2005 only stipulates the brightness of traditional outdoor advertising and signboard lighting, and does not apply to LED electronic display. It is understood that due to the disturbance of the large-size outdoor LED display screen, Wuhan City has temporarily suspended the construction of such display screens since June last year, but there is no limit to the LED screen of the bus stop. An advertising industry official said that the city needs to be embellished, LED display, neon lights, etc. are a reflection of urban modernization. The government can revise the special plan to re-require the LED brightness too bright, the flashing frequency is fast, the color chromatic aberration changes greatly, and guide the benign development of outdoor advertising.
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