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The person in charge said that the "Shanghai Urban Environment (Decoration) Lighting Code" promulgated in 2004 only stipulated the brightness of traditional outdoor advertising and signboard lighting, and does not apply to LED electronic display. When the specification was introduced, the number of LED displays in Shanghai was still small, so there is indeed a “blind spot†in the specification of brightness in this respect.
After the revised draft is issued, management measures will be taken for displays with excessive brightness. Before the introduction of the standard, the management department will coordinate the setters to reduce the impact on the normal life of the citizens by reducing the brightness, reducing the strobe and shortening the opening time.
According to an advertising industry insider, peer competition objectively makes LED screens brighter and more and more. Although the LED display is expensive, many commercial buildings and plazas do not need to pay for the LED display screen at all. Instead, the advertising company bears the relevant expenses. After that, the advertising company will pay the fees to the commercial buildings and the plaza regularly. Next, commercial buildings and squares certainly welcome the LED screen, resulting in more and more LED screens in the city. On the other hand, in order to attract attention, the advertiser also requires the advertisement to "flash, light, jump" during playback, so the LED screen will be brighter and brighter until it causes light pollution.
And a technician pointed out that from a technical point of view, it is actually very easy to reduce the brightness of the LED screen. By setting parameters in the background software, the brightness of the LED screen can be lowered in one minute. 
Shanghai will soon introduce regulations on LED display brightness standards
[High-tech LED News] In response to the Shanghai residents' reflection of the city's LED electronic display glare, affecting night traffic safety and Other light pollution issues, the relevant person in charge of the Shanghai Greening and Cityscape Bureau Landscape Management Office said that at present, "Shanghai Urban Environment ( The revised version of the "Lighting Specifications" has been initially drafted and is expected to be released in the near future. The revised draft will stipulate the brightness standard for LED electronic displays.