Effect of Spectral Radiant Distribution of Lighting on Visual Fatigue

Abstract

Recently, LED lighting has become widely used in offices and schools. Thus workers and students have to do visual task under artificial light for several hours a day. In this study, we compared the effect of CCT and the spectral distribution of light sources on visual fatigue using four light sources including white LED and fluorescent lamps. Significant differences were found in the reduced ability on eyes to focus among the four lamps. Results also showed that the narrower the spectral band width of the light source, the larger the decreasing rate of accommodation. This suggests that the spectral distribution of a light source affects the ease of accommodation.