在動植物生態學，有許多的研究著重於生態照明，例如改變照明的波長來增加生物的成長速度，增加植物的成長.太陽光在可見光區為全頻譜的分部，所以太陽為最佳應用的光源。自然導光為將太陽光傳導至室內的技術，分為集光，傳光，放光三個部分，我們加入分光鏡在傳導的部分，我們用高通與低通的鍍膜來分波長，將自然光分為紅綠藍三色供植物照明或是補足人工光源所不足的波長，在稜鏡的表面加入曲面來控制光線的發散角度，由光學模擬軟體來分析於稜鏡表面加入曲面控制光線的效果。

In thremmatology, many researches focus on ecological illumination for improving the growing speed of animal or plant. Sunlight has full spectrum so it is the most applicable source. A Natural Light Guiding System includes collecting, transmitting, and lighting parts. In our research, we would like to design a beam splitter in the transmitting part to separate the sunlight into red, green, and blue light for ecological illumination or make up the lack wavelength of the artificial light sources in door. We use high pass and low pass dichroic coatings in the beam splitter to separate the wavelength, and use prismatic structure to design the beam splitter, and use imaging QU method in the design of the non-imaging system beam splitter to control beam angle, and simulate the result of design by optical software.

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