近年來，由於材料及製造技術的進步，使得發光二極體(LED)的亮度及發光顏色逐漸增加並應用於照明上，由於LED的光譜分佈比較狹窄，可以利用多顆不同半波寬的LED來組合出想要的光源。本文使用少數顆LED加上一片固定穿透率的光學濾光片，發展出可調式自然光光源，在此光源可以模擬出符合CIE所制定的標準日光，可調整的色溫範圍為4,000K到10,000K，並且在常見色溫5,000K, 6,500, 以及7,500K擁有很好的演色性(CRI≧97)。
　　對於使用LED組合出光譜可調式光源的應用，本研究將其利用在新發明之可變色溫可變色度儀上。利用光譜可調式光源在光譜可變化的特性，加上一組光功率計，即可用來測量各種光源照明下物體的色度值，其量測誤差方均根值約在千分之三以內，色度值精確度可達光譜式色度儀。

Recently, advance in materials and manufacture has resulted in the commercial availability of light emitting diode (LED) with high luminance and wide spans of the dominant wavelengths within the entire visible spectrum. Because of the narrow spectral distribution, LEDs are being further evaluated as one of the possible standard light source. In this work, an innovative tunable daylight simulator is developed, which mainly consists of only few LEDs plus one special designed color filter with fixed transmission spectrum. This tunable daylight simulator dose simulate daylight of correlated color temperature (CCT) ranged widely from 4,000K to 10,000K with very good color rendition (CRI≧97) in spite of only the cases of CCT 5,000K, 6,500K, and 7,500K are taken into consideration during the design stage.
The application of spectral tunable light source for using LEDs, this research utilizes it on the innovative colorimeter of tunable CCT. This colorimeter consists of different dominant wavelength LEDs and a power meter can measure chromaticity value of object that various kinds of light source illuminated. The root mean square value of error is less than 0.003. The accuracy of chromaticity value can reach spectral colorimeter.

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