電力資源的消耗與缺乏在這幾年越來越被重視，為了節省能源及環保，自然光是個非常適合的選擇，太陽能是個可以無限利用的能源，本論文著重在將自然光對於室內照明的應用，自然光除了可以將光引導到室內，還能將光能轉換成電能供電給人工照明設備，對室內照明有很大的幫助。
本研究所提的自然光照明系統屬於前者，目的是將直接將自然光導入室內以作為室內照明的應用，這過程從收集自然光到將光放出的系統，本文稱之為自然光照明系統(Nature Light Illumination Systems, 以下稱 NLIS)。本文會講述NLIS會運用到的光學原理、子系統架構，並介紹各種不同應用在NLIS的元件及其演進跟優缺點。
最後會介紹我們實驗室開發的光立方模組，光立方由一個立方體為架構，搭配不同的元件，可以在NLIS中展現出不同的功能和可以自由的切換，縮小體積提升便利性，並實現在自由空間中將光線做傳輸。

The consumption and lack of power resources have been paid more and more attention in recent years. In order to save energy and protect the environment, natural light is a very suitable choice. Solar energy is an energy that can be used indefinitely. This paper focuses on the application of natural light to indoor lighting. Natural light In addition to guiding light into the room, it can also convert light energy into electrical energy to supply artificial lighting equipment, which is of great help to indoor lighting.
The natural light illumination system proposed in this study belongs to the former, and its purpose is to directly introduce natural light into the room as an application for indoor lighting. This process from collecting natural light to emitting light is called Nature Light Illumination Systems in this paper. hereinafter referred to as NLIS.
This article will describe the optical principles and subsystem architecture used in NLIS, and introduce various components used in NLIS and their evolution, advantages and disadvantages.
Finally, we will introduce the light cube module developed by our laboratory. The LightCube is composed of a cube. With different components, it can display different functions in NLIS and can be switched freely. Free space eventually transmits light.

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