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Nowadays, building energy management is more important than ever. Especially, lighting energy used in the building occupies 30% of the whole consumed energy. Therefore, reducing the consumption of lighting energy could bring effective energy saving. As the system configuration, the sum of distance between the window and the light shelf reflector and width of light shelf is set to be 500 mm at maximum. The horizontal width of light shelf is set between 200 mm, the angle of light shelf is setdoi:10.12988/ces.2014.49128 fatcat:gj5m6vzl4vevnk6akeerqpf2qm