Research of High Quality Illumination using Zonal Flux Optical Design

• Main Authors: Chih-hung Chang, 張智鴻
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/73616989664038072049

博士 === 國立臺灣科技大學 === 電機工程系 === 102 === The dissertation studied on secondary optical design for optical applications, the LED lighting fixtures were chosen during the research, based on lighting zonal flux analysis method. The mathematical model of the freeform surface were formulated according to luminous distributions of LED source and interested target beam pattern, then the control points on the freeform surface can be calculated by iterative method, hereafter using optical simulation software with Monte-Carlo ray tracing technique to verify the luminous performances. The design procedure proposed is suited for all lighting applications, especially applicable to design of the LED optical component. This research is aimed at the analysis and design for LED TIR lens and street lighting. The TIR lens designed for batwing beam pattern, oval beam pattern and special narrow angle pattern for a novel LED light module, chip-on-board (COB) provide high efficiency, high uniformity and accurate beam angle luminous distributions. The lenses for street lighting are developed for different considerations, uniform illuminance and uniform luminance respectively, by combing with roadway brightness coefficient to achieve higher lighting quality satisfying safe and comfortable driving need for all drivers. Due to objectively choose lighting fixtures and evaluate lighting quality quantitatively, we propose a systematic method to compare the performances between LED fixtures and traditional fluorescent fixtures for indoor lighting. The result shows that the newer designed and advanced LED fixture with batwing beam pattern is more suitable for large lighting area to achieve better uniformity and 36.7 % energy saving. The lighting power density (LPD), for 500 lux illuminance and 79 % in uniformity, is 4.05 W/m2 only, excellent over than all commercial LED lighting fixtures.