近年來，人文科技的快速發展造成能源耗竭，綠能產業逐漸被人們重視，太陽能源的應用更被全球產業與學者廣泛研究及應用，其中為了發展健康及節能照明，因此設計出可將太陽光導入室內作為照明使用的自然光照明系統。然而自然光照明系統的輸出效率會因為導光管輸出的發光半角太小以及太陽光在不同時刻其能量不同，而造成低效率且不穩定的照明效果。因此本論文利用反射結構將導光管的輸出光展角展開，並結合發光二極體(LED)及自然光照明系統(Natural Light Illumination System, NLIS)，且利用自由曲面之反射面將兩種不同配光曲線的光源變成相同的配光曲線，使自然光及人工光源可同時做為照明使用。此外藉由空心(Air-Type)結構之設計，可以大幅降低元件所需的材料來降低成本。經由此元件作為照明時，皆可使室內照明環境中的工作面在不同時間點下保持533 lux 及均勻度為83%。

Green energy has undergone a soaring development and has been the subjects for many applications. Many research and studies have focused on illumination with sunlight without electricity to save energy. This paper presents a novel reflecting freeform surface component which combines electricity light and natural light as the input sources. Using this design, unstable sun lighting problem can be avoided and provides wide half angle to build a uniform illuminative environment. Furthermore, the use of reflective elements significantly reduces the thickness of the structure to less amount of material used thus reduce the cost. Our results show workplace has 533lux and 83.82% uniformity.

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