Abstract
The paper demonstrates the effect of lens inner structure on radiation pattern and light extraction efficiency of LED and the application to artificial light in compact greenhouse. A commercial software package of Trace Pro and one-factor at-a-time method are used to simulate the lens with different inner structure. The optimum parameters of lens inner structure design for the maximum light extraction efficiency and the best uniform luminous are described by the corner radius of curvature, lens width, and lens height, respectively. In comparison with a commercial artificial light of LED matrix used in agriculture, the high-power LED module with proposed lens inner structure exhibit good improvement in uniformity of illumination and light extraction. This study may provide a practical guideline for design and fabrication of a high-performance lens used in various compact agricultural applications.
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