Optical design of tunnel lighting with white light-emitting diodes

Ming Shiou Tsai, Xuan Hao Lee, Yi Chien Lo, Ching Cherng Sun

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


This paper presents a tunnel lighting design consisting of a cluster light-emitting diode and a free-form lens. Most of the energy emitted from the proposed luminaire is transmitted onto the surface of the road in front of drivers, and the probability that that energy is emitted directly into drivers' eyes is low. Compared with traditional fluorescent lamps, the proposed luminaire, of which the optical utilization factor, optical efficiency, and uniformity are, respectively, 44%, 92.5%, and 0.72, exhibits favorable performance in energy saving, glare reduction, and traffic safety.

Original languageEnglish
Pages (from-to)H114-H120
JournalApplied Optics
Issue number29
StatePublished - 10 Oct 2014


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