文献类型：期刊文献

英文题名：Enhancing Light Utilization Efficiency of Dragon Fruit Canopies Using Bi-Directional Adjustable-Focusing LED Lighting System

作者：Jiang, Qiannan[1]; Zhang, Qiaoyang[2]; Chen, Haiyun[1]; Ruan, Jiacheng[1]; Wang, Wensong[3]; Fouzder, Tama[4]; Wang, Ji[1]; Xiao, Hua[1]

机构：[1] Guangdong Ocean University, School of Electronic and Information Engineering, Department of Electronic Engineering, Zhanjiang, 524088, China; [2] Guangdong Ocean University, School of Mathematics and Computer Science, Zhanjiang, 524088, China; [3] Chinese Academy of Sciences, Aerospace Information Research Institute, National Key Laboratory of Microwave Imaging, Beijing, 100190, China; [4] Department of Electrical and Electronic Engineering, Daffodil International University, Bangladesh

年份：2025

外文期刊名：IEEE Photonics Journal

收录：EI(收录号：20255319832214)、Scopus(收录号：2-s2.0-105025979753)

语种：英文

外文关键词：Angular distribution - Fixtures (tooling) - Fruits - Genetic algorithms - Light emitting diodes - Lighting fixtures - Monte Carlo methods - Ray tracing

外文摘要：Commercial light-emitting diodes (LEDs) offer fixed lighting patterns with limited canopy coverage, creating a mismatch with dragon fruit's dynamic photosynthetic and phenological needs. To mitigate the inherent limitations of conventional unidirectional irradiance distributions, a bi directional emission LED system incorporating adjustable focusing mechanisms is engineered. Monte Carlo ray-tracing and numerical integration are employed to quantitatively analyze the influence of plant architectural complexity, LED positioning strategies, and angular emission profiles on canopy light distribution. Concurrently, three optimization algorithms— Simulated Annealing (SA), Genetic Algorithm (GA), and Ant Colony Optimization (ACO)—are comparatively evaluated for their efficacy in maximizing radiation efficiency (RE) and utilization efficiency (UE). The proposed method (1) achieves targeted photon delivery while minimizing light spillage between canopies, resulting in 39.39% and 206.67% higher UE compared with the other two schemes under the same static fixture at a height of 1.7 m and an emission angle of 50°, and (2) achieves high prediction accuracy, with RE and UE determination coefficients (R2) of 96% and 97%, respectively. ? 2009-2012 IEEE.