Energy saving in lighting system with fuzzy logic controller which uses light-pipe and dimmable ballast

Approximately, 20% of the electricity consumed in the world is spent for lighting. More efficient utilization of the sun, as a natural source of light, for lighting would save electricity used for lighting. The aim of this study is to illuminate a windowless room via a light-pipe and dimmable electronic ballasts. Light-pipe is used for the illumination of the space during the daytime. In case of inadequate daylight, artificial lighting is made via dimmable electronic ballasts and fluorescence lamps. Artificial lighting is supervised by a fuzzy logic control system to keep the illumination level at 350 lux. When there is a motion in the room, the system works with the message of the motion sensor, which, thereby, enables energy saving. Additionally, dimming the lamps result in conversation of the electrical energy used for illumination. After the experimental studies, 350 lux value targeted in the work plane is achieved with ±10 lux error.

► The aim of this study is to illuminate a windowless room via a light-pipe.
► This study is carried out in Istanbul.
► Controller is designed for the artificial lighting system.
► The room is illuminated with daylight by using light-pipes.
► Approximately 30% saving was achieved by the proposed controller implementation.