近年來LED 照明發展快速，其應用方面從面板、交通警示燈到照明應用，發展的過程不過短短數年間。而在照明部分，一般認為路燈為可行性最高之LED照明。但由於LED多為Lambertian光源，具有發光指向性(集中)，用在路燈設計上時，會有明暗不均勻的情況。
本研究最大的目的在使LED路燈有更均勻的光強度分配，藉此改善路面照度的均勻性，以提高所有用路人的安全、拉長路燈間距、節省成本，甚至達成小功率大運用的目標。並對不同安裝角度進行散熱分析，再配合光場形分析設計，以找出一適當安裝角度。
本論文利用Tracepro光學模擬軟體及flotherm數值模擬軟體進行分析，並與實際量測數據比較。結果顯示路面照度長寬比以將近3:1，根據內政部營建署的規範，此一40W之小功率路燈已符合住宅區巷弄照明之要求。

The applications of LED lighting gradually change from panel backlight and traffic signal light to general lighting in recent years. It is generally believed that LED light source possesses great potential in replacing other light sources in street lamp application. However, the Lambertian nature of LED light source causes non-uniform lighting when used directly without light pattern modification.
The goal of this study was to alter the light pattern of an LED street lamp to achieve uniform illumination, while still maintaining a good thermal dissipation design. Tracepro was used to simulate and design light pattern while Flowtherm for thermal simulation. A street lamp of 40 W in LED driving power was fabricated according to the simulation and design, and its performances were compared with the simulated results. The light pattern of this street lamp exhibits a length to width ratio of 3 to 1, which complies with the domestic standards for alleys.

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