Visual Perception and Alertness in Dependence on CCT for LED Lighting in Classroom

Classroom lighting significantly affects student performance and productivity, as well as visual comfort and daytime alertness. The spectral distribution of LED light sources is different from that of traditional light sources, it may affect the individual’s performance and feelings. The aim of this study was to investigate how correlated colour temperature (CCT) of LED lighting affects the alertness and visual perception of college students. Initially, the impact of different correlated colour temperatures (4000 K, 5000 K, 6500 K) on subjective alertness was studied, and questionnaires was used to assess visual comfort by visual-perceptual experiments. The results show that increasing correlated colour temperature helps to improve subjective alertness and visual comfort in a appropriately rang, but a too high correlated colour temperature levels may increase visual fatigue and affect comfort of individuals. The participants were more comfortable at 5000 K than at high and low correlated colour temperatures. This found understanding aiding the advancement of high-quality lighting environments prioritizing visual health and work efficiency.