The light efficiency and irradiance uniformity of Fresnel lens sheet and semi-circular diffuser sheet which composed of diffuser and prism function are also discussed here.

• 并结合扩散板与稜镜片功能，设计一菲涅尔透镜与半圆灯罩式扩散片，取代传统扩散板，讨论其光使用效率与光均匀性。