Rong-Seng CHANG^*, Tung-Yen LI¹, Ko-Wen JWO¹, Sha-Wei WANG², and Jang-Zern TSAI¹

Department of Optics and Photonics, National Central University, No. 300 Jhongda Rd., Jhongli 32001, Taiwan, R.O.C. ¹Department of Electrical Engineering, National Central University, No. 300 Jhongda Rd., Jhongli 32001, Taiwan, R.O.C. ²Department of Optometry, Jen-Teh Junior College of Medicine, Nursing, and Management, 35664 Hou-Long, Miaoli, Taiwan, R.O.C.

(Received April 28, 2011; Accepted December 14, 2011)

We develop a novel light bar waveguide design to produce a glareless light-emitting diode (LED) lighting tube. We design optimal parameters, such as the gap y between the tube and the reflective surface, the relative distance x between the lens and the LED, and so on. Using these parameters, we fabricate an illumination system consisting of LED light bulb installed at both ends of lighting tube. The lighting tube is shaped the same as a traditional fluorescent lighting tube in order to replace traditional lighting tubes without the modification of the lighting stand. The LED lighting tube is glareless to the observer from the side view.

Key words: Taguchi method, glareless, LED, lighting tube

^*E-mail address: rschangoptical@gmail.com