Taking building lighting system as the entry point of reducing building energy consumption,the paper analyzes current lighting system problems,describes energy-saving optimization measures of building lighting system from aspects of using natural lighting,using high-efficiency light source,and improving automatic control system,so as to achieve the goal of reducing energy consumption.%将建筑照明系统作为降低建筑能耗的切入点，分析了现有照明系统存在的问题，从利用自然采光、使用高效光源、完善自动控制系统等方面，阐述了建筑照明系统的节能优化措施，从而达到降低能耗的目标。
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