Janga, Baikb, and Kumc evaluated workplace user responses to varying light conditions. They report that “A series of experiments were conducted . . . for workplane illuminances of 500 lx, 650 lx, and 800 lx in real office environments under five levels of illuminance variations. . . . none of the constant workplane illuminance caused visual discomfort or dissatisfaction. Illuminance variation was perceived most strongly under the workplane illuminance of 500 lx, and the effect of illuminance variation on the perception of glare was the weakest under the workplane illuminance of 800 lx. As the variation ranges in illuminance increased, the degree of perceived visual satisfaction diminished stably. . . . The maximum permissible ranges of illuminance variations that maintained visual comfort were 150.0 lx, 135.2 lx, and 121.9 lx for paper-based tasks and 126.9 lx, 115.8 lx, and 80.8 lx for computer-based tasks when the workplane illuminance were 500 lx, 650 lx, and 800 lx, respectively.”
Seoyeon Janga, Yong-Kyu Baikb, and Sooyoung Kimc. “Analyzing the Effects of Illuminance Variations on Occupants’ Visual Perceptions to Determine Permissible Dimming Controls of Lighting in Small Offices.” Building and Environment, in press, https://doi.org/10.1016/j.buildenv.2024.111322