A Study on Pendant and Blackboard Asymmetric Lens LED Luminaires for Optimal Illumination in Classrooms

Duong Thi Giang (), Pham Hong Duong, Nguyen Van Quan, Tran Ngoc Thanh Trang and Tran Quoc Khanh ()
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Duong Thi Giang: Cooperman Laboratory, Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
Pham Hong Duong: Cooperman Laboratory, Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
Nguyen Van Quan: Faculty of Mechanical Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet, Co Nhue 1, Bac Tu Liem, Hanoi 100000, Vietnam
Tran Ngoc Thanh Trang: Department of Interior, Hanoi Architectural University, 10 Nguyen Trai, Thanh Xuan, Hanoi 100000, Vietnam
Tran Quoc Khanh: Laboratory of Lighting Technology, Department of Electrical Engineering and Information Technology, Technical University of Darmstadt, 64289 Darmstadt, Germany

Sustainability, 2024, vol. 16, issue 22, 1-16

Abstract: This study examines the transformative impact of integrating pendant asymmetric lens (PAL) and blackboard asymmetric lens (BAL) LED luminaires to enhance classroom lighting, with the goals of replicating the ambient effects of natural daylight and promoting energy efficiency. This research focuses on improving the quality of learning environments through uniform, soft, and diffused lighting, which mimics sky-like illumination while adhering to sustainable energy practices. Advanced asymmetric lens LED luminaires are employed to achieve optimal lighting distribution, as indicated by luminous intensity distribution curves. Comparative analyses in diverse educational settings reveal significant improvements in ceiling illuminance, ranging from 935 to 1000 lx, and workspace illuminance from 660 to 720 lx, with reduced glare (UGR < 10). This results in bright, visually comfortable spaces conducive to learning. Additionally, the PAL and BAL solutions outperform conventional lighting systems like stretched ceilings and lightboxes by maintaining clear overhead spaces, eliminating shadows, and offering cost-effective solutions. This successful integration demonstrates a notable advancement in the development of energy-efficient, visually comfortable educational environments, contributing to the goals of sustainability and improved well-being for both students and teachers.

Keywords: asymmetric lens; illuminance uniformity; glare free; shadow free; sky-like ceiling; LED luminaire; classroom lighting (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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