高輝度発光面が動的刺激への応答特性に与える影響

抄録

High-power LED floodlights for sports stadiums such as baseball and soccer stadiums have become increasingly popular and have already been installed in many facilities. LED floodlights consist of many LED chips that each have a small and high luminance light-emitting surface. Therefore, when a ball overlaps with the lighting fixture in a player’s visual field, a temporal vision loss due to the afterimage of an intense light-emitting surface, i.e., disability glare, occurs together with an excessive discomfort glare.

In this study, we investigated the effect of direct viewing glare due to LED floodlights on a player’s performance by measuring the reaction time for catching moving stimuli presented with a glare stimulus, a high-intensity LED light source. Three different trajectories (low, middle, and high) were used as moving stimuli. The error rate greatly increased in the low-trajectory condition at the glare luminance of 1.2×10⁶ cd/m² but only slightly increased in the medium-trajectory condition at the same luminance. This indicates that the luminance of LED floodlights in a lighting tower should be kept below 1.2×10⁶ cd/m² to avoid unexpected errors due to direct viewing glare.