Starting from January 28, the "technical specification for mobile outdoor advertising in Shanghai (Draft) " has been soliciting opinions on the official website of the municipal greening and Urban Appearance Bureau. Mobile outdoor advertising on vehicles, ships, airships and other carriers will not be allowed to have electronic display screens, the luminance of the advertisement lighting should be less than 500CD / M2 CD / M2 refers to the luminance per unit area. And the reporter concerns, although the standard of mobile advertising has been clear, but shopping malls, buildings electronic display screen "light pollution" because of the lack of standards, has been unresolved. "Many electronic displays on Huaihai Road are as bright as searchlights, which are too harsh. " Dozens of LED screens on Huaihai Road Flicker to pedestrians from all directions, making the eyes uncomfortable. Xiao Wang, a taxi driver, said that a large LED screen over the southern mall, facing the direction of the elevated road, often caught the light when driving on the elevated road at night, "The bright lights can affect the view of passing vehicles and pedestrians and distract the driver, which creates a big safety hazard. Especially for drivers who have not been driving for a long time, they are more susceptible to interference and influence,"said Xie Xiaodong, senior engineer at the New Technology Division and Research Institute of Engineering and construction of the Shanghai Academy of Construction Sciences, and Wu Jianchun, an optical engineer, who measured LED displays in several shopping malls in downtown Shanghai, the results showed 556 CDM2 on the advertising display above Pacific digital plaza in Xujiahui and 755 CDM2 on the Konica Minolta display at Citic Bank. The LED display on the plaza of the sun and moon reached a brightness of 2600CD / M2, and the electronic display on the plaza of Wuning road reached a brightness of 2250CD / M2. Compared to the 500CD / M2 in the mobile outdoor advertising regulations, the electronic display screens on the external walls of buildings and shopping malls are more dazzling. When will the brightness standard come out? It is understood that the installation of LED screen settings, play content are approved by the relevant departments and supervision, only the brightness, but there is no unified standard. What kind of brightness does not cause "light pollution" ? There was never a uniform rule. Mr. He, assistant manager of the Operation Management Department of a large shopping center, said that in the LED screen operation, shopping malls also Stuck in the Middle. "there is no specific standard for the brightness of LED screens, so the shopping mall can only adjust according to the feedback of the public, but some people feel bright, some feel dark, and many people find it difficult to adjust, so we can only seek a relative balance, " said the person in charge of the Landscape Department of the Shanghai Greening and Cityscape Bureau in an interview, because the LED screen brightness problem elasticity is very big, just like People Watch TV, personal preference is different, difficult like outdoor fixed advertising as a fixed standard. City Green and City Appearance Bureau in the audit LED screen, in the absence of damage to the naked eye, there is no specific requirements for brightness. "The 2004 Shanghai Standard on lighting for Urban Environment Decoration only stipulates the luminance of traditional outdoor advertisements and signboards, but it is not suitable for LED electronic displays. " Due to the introduction of the code when the number of Shanghai LED display is not much, at present, it is clear that this rule has been "outdated. ". Shanghai Environmental Protection Bureau officials also said that at present, China has no relevant regulations to restrict this "light pollution" , as well as the treatment of noise pollution as defined standards, it is difficult to deal with such complaints specifically. With the popularization and use of large-scale LED screen in cities, relevant departments should formulate relevant laws and regulations as soon as possible, and unify the brightness standards.