本論文中，我們針對五款相似封裝形式的高功率LED，分析各LED驅動在相同之電流密度下，其光通量密度之優劣比較，藉此我們可以找出具有優勢的LED光源，並設計出高中心照度之投射型燈具。在論文中，我們會先以LED晶粒大小來分析光通量密度之變化，接著再加以考慮LED封裝體對光通量密度之影響。最後，藉由以上結果，我們設計出以德國StVZO 22A No.23 (K-mark) 法規為規範的微型化腳踏車燈，並且以極小化的體積、高對比的光型及寬廣的道路照明為設計特色。

In this thesis, we focused on five similar packages of high-power LEDs and analyzed the effective exitance of each LEDs, which were driven at the same current density. Effective exitance was depended on efficacy and emitting area. When the light passed through lens encapsulation, the emitting area would be changed. Finally, we designed a miniaturization bike lamp, the light source of which was the highest effective exitance LED, for meeting K-mark regulation. The prototype was fabricated by CNC machining and the measured light pattern was similar to design one.

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