Fuzzy logic controller for energy savings in a smart LED lighting system considering lighting comfort and daylight

• A fuzzy logic controller is designed to save lighting energy consumption.
• Experiment and simulation results verify the effectiveness of the controller.
• The smart LED lighting system can regulate lighting output automatically.
• Users can choose their illumination levels according to various lighting preferences.

In commercial buildings, lighting constitutes a large proportion of energy consumption. Saving lighting energy in commercial buildings has aroused great interest among researchers. Achieving energy savings and satisfying lighting comfort are the two primary objectives in designing a lighting system. In this paper, a fuzzy logic controller was designed that considered daylight, movement information and lighting comfort. The DALI protocol was used to communicate the controller with LED luminaires. The simulation results demonstrate that lighting system without control can provide sufficient illumination. The lighting system provides wider controllability to make lighting environment operating at the most energy-saving state. The experimental results show that by using the designed controller, significant lighting energy can be saved. The office where the smart LED lighting system is installed can regulate lighting output automatically based on users’ movements and allow users to choose their own lighting preferences.