在能源日益短缺的今日，如何的節省不必要的能源浪費與開發新的再生能源已經是當前最重要的課題，而每年在消耗在照明上的電力約佔所有用電量的10%~20%，而在當前所有的再生能源當中太陽光是最乾淨無汙染而且取之不盡用之不竭的再生能源，所以我們如果可以將太陽光使用於照明上，必定可以大大的節省能源用於照明上的損耗。但要如何的將太陽光運用於照明之上，所以就有許多的自然導光系統應運而生，而自然導光系統即是利用光學元件將自然的太陽光導入室內作照明的使用，整個照明的過程無須消耗電力，所以沒有能源浪費。而目前已經發展有許多種的自然導光方式，而本篇論文即在探討各種不同方式的自然導光系統的建構，與評估各種環境就需要搭配合適的自然導光系統，提供日後自然導光系統建構時的評估參考依據。

In recent years, green energy has undergone a lot of development and has been the subject of many ap-plication. Many research studies have focused on illumination with sunlight as a means of saving energy and creating healthy lighting [1]. It has been the most important issue how to save energy and the development of new renewable energy sources in growing shortage of energy[2-7]. The electricity consumption for lighting accounts for about 10% of all electricity consumption to 20% every year [8].Now developed many kinds of natural light system methods. Natural light systems have collecting, transmitting, and lighting elements. This system will provide a great number of benefits for the people who use it[1]. By this system, we can bring daylight into interior for lighting use. This paper is to discuss different construction of natural light system and introduct a variety of environments which need to the natural light system that provides natural light guiding system constructed index.

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