Wireless sensor networks (WSN) are currently being applied to energy conservation applications such as light control. We propose a design for such a system called a Lighting Automatic Control System (LACS). The LACS system contains a centralized or distributed architecture determined by application requirements and space usage. The system optimizes the calculations and communications for lighting intensity, incorporates user illumination requirements according to their activities and performs adjustments based on external lighting effects in external sensor and external sensor-less architectures. Methods are proposed for reducing the number of sensors required and increasing the lifetime of those used, for considerably reduced energy consumption. Additionally we suggest methods for improving uniformity of illuminance distribution on a workplane’s surface, which improves user satisfaction. Finally simulation results are presented to verify the effectiveness of our design.

Recently, wireless sensor networks are used in an expanded bulk of utilizations. In this research, a lighting control system is proposed on basis of wireless sensor networks named LACS (Lighting Automatic Control System). This system with the ability of explaining the users' activities, in addition to providing the needed lighting which provides the satisfaction of users, will provide energy saving and management.In this paper the particles of LACS, their way of relationship, and decision making algorithm are discussed. Meanwhile algorithm prevents waste of energy by reduction of relation with sensors at the time of decision making. The possibility of collecting information for offering various reports, and the possibility of regulating the accuracy level of the system are other facilities of the proposed system. Finally there is a real scenario offered on the proposed system and system assessment according to the production level of lighting intensity and the level of system accuracy is done.