LED在戶外照明的Lambertian光型，在視覺效果上容易造成亮度不均勻以及對比過於強烈，為了避免光害以及維護道路照明品質，本研究使用TracePro軟體設計一個非軸對稱的二次光學透鏡，並利用軟體內建的優化器功能，以「全台設置LED路燈技術規範」為目標，將道路照明範圍提升到燈桿高與燈桿間距比為1:4.5，最後以DIALux軟體對路燈照明效果進行各項評估，其平均照度≥15lux以及均勻度≥0.33，顯示本設計滿足道路照明標準。;When applied outdoors, LEDs give a Lambertian distribution of luminance which can result in a harsh divergence of brightness. In order to prevent the heterogeneous luminance patterns and minimize the light pollution whilst maintaining the quality of roadway lighting, software TracePro is incorporated in this study to create an initial model of asymmetrical secondary optical lens. Since the objective of this research is to comply with “the regulations of LED street light technology in Taiwan”, the built-in optimizer of the software is utilized to maximize the ratio of pole distance/pole height to 1:4.5. An overall evaluation of this lighting design with software Dialux indicates that the average of illumination is above 15lux and the uniformity is above 0.33 which meet the standard requirements of roadway lighting.
