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It is reported people spend more than 90% lifetime indoors, leading to the great increase of lighting energy consumption indoors. An intelligent and energy efficient lighting system is proposed in this paper to solve the problem of energy waste, high error rate and high complexity in the current lighting system depending on the occupants’ behavior. The electromagnetic wave propagation model is first optimized to predict the accurate position of occupants, followed by which the whole lighting system is switch on or off dynamically, targeting at the energy efficiency of the buildings. Experiment results show that the system, compared with the existing lighting system based on voice control, can improve the energy efficiency of lighting indoors at least by 15%, with a lower error rate below 2%.