Experimental Study On The Intrusion Of Instantaneous Change Of Colored Luminance To Residents From LED Advertising Screen

LED advertising screens have been extensively used along with the development of nightscape lighting construction.In the meantime,the issue of luminance intrusion to residential buildings in urban and surrounding areas also have become increasingly outstanding,which will turn it into a problem to be reckoned with.The intrusion from LED advertising screen used for function,identification,advertising and other lighting application,has the characteristics of wide distribution,high brightness and variety,variety of color,long duration,fast flashing frequency and so on.It will be a great significance in the field,since there is little research on intrusion of instantaneous variation of colored light to residential areas from LED advertising screens.The research is based on this background which aims to study quantitatively on how the dynamic colored light intrude the residents from the LED screens in urban lighting.The innovation point of this paper is to clarify the experimental conditions and methods through pre-evaluating and optimizing the original evaluation method in the existing physical laboratory environment,starting from the subjective feelings of the residents.Through the evaluation experiments of the instantaneous brightness change of colored light invasion,the difference threshold of the instantaneous brightness change of the LED advertising screen dynamic colored light is obtained.The research of luminance intrusion are listed as follows.First of all,on the basis of summarizing relevant literature both at home and abroad,the complexity and influence factors of LED screen interference in indoor activities are analyzed.Furthermore,it is found that the impact of LED screen dynamic colored light on the indoor activity of residential area lacks specific quantitative research,and the specific data can not be provided in the specific control stage of LED screen setting.Secondly,this article sums up the basic data in the early stage of the project,and establishes a database of dynamic colored light intrusion of LED screen.Combined with the previous research,the invade factors of the intrusion of the instantaneous brightness change of colored light in the LED advertising screens are limited to three types of brightness change(luminance difference),light color change and the changing frequency of the picture,and the range of the photometric parameters of the intrusive dynamic colored light of the LED screen is also determined.Moreover,after determining the typical windows and the sizes of living rooms,a laboratory is created basing on the intrusive factors and parameter ranges of the instantaneous brightness changes of the LED advertisement screen.Through the simulation of dynamic light invasion of the windows,the reappearance of LED advertising screen’s instantaneous brightness change can be achieved under laboratory conditions.The questionnaire was designed using Likert Scale Method,and after screening the experimental parameters from pre experiment and the reasonable experimental process,the subjective evaluation experiments of large batch were carried out.Finally,the differential threshold of the instantaneous brightness change of colored light of LED screens is calculated according to the statistical results of the subjective evaluation questionnaire and the operation definition of threshold.The results shows the achievement of quantitative research on instantaneous variation of colored light of LED advertising screens and also provides basic research data for the establishment of prevention of luminance intrusion and modified illumination design standard of residential buildings.