In recent years, with the rapid development of LED light sources in road lighting applications, LED lights for discomfort glare problems caused by drivers and pedestrians attracted more and more attention. In many areas, nighttime drivers repeatedly suffered reduced night vision lights brightness caused by a sudden change, reducing the driving lights provide safety benefits, especially the newly popular widely installed energy-efficient LED lights seemed to make it worse.
A group of researchers from China and the Netherlands have developed a method to assess the impact of uncomfortable glare LED road caused by people, creating a model that can evaluate a variety of lighting conditions driver discomfort level. Team of researchers from Fudan University, Philips Research Asia (Shanghai, China), Human Technology Interactive Group, Eindhoven University of Technology and Philips Research Laboratories (Eindhoven, The Netherlands).
Discomfort glare is notoriously difficult to characterize, glare study conducted by Shanghai Fudan University and Eindhoven University of Technology to China, the focus is to find the cause discomfort glare, the human face of the key factors leading to the need to avoid the eyes of the light source, the the team set up a laboratory to simulate the lights work scenes, volunteers observe simulated 72 different lighting conditions.
Investigation, the team designed a laboratory setting, mimicking the way the lighting conditions under different conditions. Researchers will a floor and walls of the room all blacked out, and put a different light to mimic the surrounding lighting conditions in the room, the researchers adjusted the LED lights on the dark road light, create 72 kinds of different lighting conditions, volunteer observers were asked to rate the level of discomfort glare is defined, the table has nine rating scale from “modest” to “unbearable.”
The test also has some reference to glare test before the study, Lin Yandan said:. “While traditional sources of discomfort glare features LED lights, it may not be applicable, but the glare of the factors that may affect the comfort remain unchanged,” the researchers modified the system experimental four-point lighting parameters: Brightness LED lighting, background brightness, from the observer’s point of view the apparent size of LED lights, LED and observer angle of sight.