A lighting control system to optimize brightness distribution on working places

We are conducting research and development on an intelligent lighting system that can improve both workers' comfort in an office and reduce electricity consumption of lighting. Upon introducing this system in an actual office, we were able to realize both an improvement in workers' comfort and a drastic reduction in electricity consumption. Furthermore, in office lighting design of recent years, brightness design has become important in addition to illuminance design. In this paper, we propose a new lighting control system that realizes a brightness distribution within a worker's field of vision that they find comfortable. A mechanism that considers brightness distribution in a worker's field of vision has been added to the previous model of an intelligent lighting system that only controlled desk-surface illuminance. Experimental results indicated that target brightness distribution within a worker's field of vision could be realized. It was also shown that, by having a system learn the brightness distribution a worker finds most comfortable, the targeted brightness distribution can be provided even when display brightness is changed during work.