"The electronic display screen light as the searchlight, it's too harsh, drive came over almost out to my eyes." A drives through the city center city a driver of malls speak thus.
"Especially flash on the screen when the rearview mirror, blu-ray is a piece of blue, what all can't see, it's not safe." For LED screen, Shanghai advertising a taxi driver also have a lot of complaints.
With each of the Shanghai business LED display springing up erected by the night, shen dressed up more and more beautiful. And then bring light pollution, traffic safety and more problems. However, at present, outdoor advertising management measures, technical specifications on Settings large LED display slightly provisions lags behind. Therefore, the personage inside course of study thinks, it is necessary to the LED display centralised planning and management, including the large screen size, setting of the area and a regional set up the number of defined, etc.
Brightness "overweight" too dazzle too bright
Every night, at night, Shanghai city center flickering high-grade business building external wall began to play huge color ads, attract passers-by eyes. Pudong lujiazui business district of some famous building metope, a piece of thousands of square meters of the LED display advertising, the huge jump in with the light has appeared, various design also shown.
Along with the development of technology, Shanghai LED some building developers to start in building metope LED display, the momentum set is on the trend spread. The industry estimates, more than 30 square meters of Shanghai's existing display of more than 20, the biggest of the LED display of 6000 square meters, equivalent to 20 the area of the basketball court, investment of nearly ten million yuan.
Shanghai city HuanWeiJu landscape management office director GuoHua revealed in the business district building, is now on its popular large LED display, not only did not deal with relevant formalities for examination and approval of outdoor advertising, and probably can be in imperceptible in pollution to the surrounding environment, and even the serious influence around the landscape harmonious atmosphere.
According to Shanghai a the construction design company introduces the chief architect, Shanghai LED display somewhere lasts till the evening to turn out the lights, display screen and strong and continuous bouncing around the lights make office staff and overtime researchers could not work normally, and residents have to to night around 11 after when go to sleep.
Shanghai division courtyard engineering building new technology department and research institute of the senior engineer XieXiaoDong, optical engineer in Shanghai city center WuJianChun had several business circle to the LED display measured, and the results showed that the Pacific xujiahui digital square the upstairs Canon display advertising brightness for 556 CD / ㎡ (CD / ㎡ per unit area brightness shine); Shanghai six hundred malls display advertising on the sharp brightness for 439 CD / ㎡; West Asia hotel on the optimal division haoma tire advertising display screen brightness for 499 CD / ㎡; Citic bank konica minolta photo on the screen brightness, achieve higher advertising 755 CD / ㎡. And in the central square, get on the moon, the LED display brightness incredibly reached 2600 CD / ㎡; Wuning road I on the square's electronic display screen brightness are as high as 2250 CD / ㎡.
WuJianChun said, measurement of the LED display area is all in 10 square meters. According to the 2004 of the implementation of the "Shanghai urban environment (decoration) lighting standard", commercial light box ads, signs of more than 10 square meters, area of maximum allowable brightness shall not exceed 400 CD / ㎡. According to a standard, if the screen brightness exceed bid.
The LED screen into dazzling light pollution
Shanghai citizens lu said, last year once he drove through downtown Shanghai lianhua road south road of mall, and LED screens, feel very dazzling relative head-on. Whether colour or bright white screen, are dazzling. Especially when screen background appear bright white, to stab could hardly keep my eyes open, it is easy to spread the driver's attention, great potential safety problems, and to some drive age not long for, this driver is more vulnerable to interference and influence.
"In fact the human eye is very sensitive to the colourful." East China university of science and technology the physics professor unfoldings says, when the LED display with the same frequency play different advertising, part of the advertising might give someone dazzling feeling, cause tourists mood, psychological discomfort, this should belong to light pollution. "During the day, and compared the pupil in the evening put more greatly, so even if the light intensity and the same day, but at night may make people sick".
"Peer competition to become more and more bright LED screen objectively, more and more." Shanghai a advertising industry insiders explained, the LED display though expensive, but now many stores don't need to pay their own way installation, but by advertising company to undertake related expenses, advertising company will also regularly after to market pays fee. On the other hand, in order to attract eyeball, advertising the requirements during the broadcast advertising "lightning, bright, the jump", therefore LED screen and the brighter YueDiao, until the cause of light pollution.
Shanghai is the first ten people's hospital excimer laser eye department directors, said YuJing too bright LED screen to the human eye may bring two hurt, one kind is when the human eye by high brightness dazzle light stimulation of eyes narrowed eyes, pupil, will obviously don't feel comfortable, and the other is the screen a half-there, light frequency is too high, will the human eye of retinal macular have a serious effect, long-term damage even cause macular degeneration.
Shanghai semiconductor lighting engineering technology research center of comprehensive evaluation LiShuZhi said, actually reduce the brightness of the LED screen is very convenient, through the backend software installed parameters, a minute to downgrade the LED screen brightness.
No standard for brightness measure
According to information, LED display installation, played content is by related departments and supervision, examination and approval only no unified standard in brightness, and that has become a regulations "blind spots". The international general light pollution into three classes, namely white pollution, artificial the day and the colourful pollution. And only to the white pollution in China at present the glass curtain wall have relevant regulation, the day and the colourful pollution of artificial still do not have relevant regulations.
Shanghai bureau of city greening and landscape place officials say, at present there is no related Shanghai LED display brightness standards. "2004 years" issued by the Shanghai urban environment (decoration) lighting only stipulate the standard "traditional outdoor advertising, signs the lighting intensity of, do not apply LED electronic display screen." This standard issued the Shanghai when LED display the number is not much, so the luminosity of the standard exists "blind spots".
However, it is understood that the Shanghai urban environment (decoration) lighting of the "standards is expected to come on stage, the recent submissions a submissions will provisions LED display brightness the standards, the screen brightness to exceed bid to take management measures.
According to a LED the manufacture enterprise engaged in chief discloses, LED lamp national standards are brewing process, controversial LED light pollution problems will be effectively. The official pointed out: "LED lights the advantages of environmental protection and energy saving has been without controversy, and currently the only needs to solve is light pollution. Within the industry a batch of strength and technology can't keep up with enterprise, with the promulgation of the national standard will be out of business, nearly 30% of the enterprise faces this destiny LED."
Industry insiders point, the relevant national policy just stop the LED display light pollution of a legal means, and really reduce light pollution also LED display to advertisers and the user's actively cooperate with.
