過去，人類總是日出而作日落而息，遵循著自然日光的變化，但在現代化的社會中，人類大多數的時間都處在室內環境中並仰賴著人工照明，而過往的人工照明僅注重色彩表現與發光效率，沒有考量晝夜節律的影響，導致現代人晝夜絮亂，甚至引發生、心理方面的疾病。因此，開發以人為本的照明系統是至關重要的。
現在，市面上常見的可調光LED燈具，通常只在色溫2700 K至6500 K之間做線性調光，而新型的RGBW與RGBCCT光源雖然有更廣的色溫調節範圍，但在光色品質與晝夜節律方面的表現並無明顯提升，遠遠不及自然日光所提供的。
所以，本論文透過演算法擬合光譜與LED混色技術，以涵蓋色溫1800 K至10000 K為目標，再以Ra>95、Duv介於±0.003的指標作為條件，擬合出最佳化的全色溫日光光譜，最後結合光學設計、照度模擬、眩光計算，開發一盞類自然日光，符合CNS標準的可調節晝夜節律的檯燈燈具。
同時，本論文將此全色溫日光光譜，與CIE標準光源、實際日光光譜、市售燈具進行光色品質與晝夜節律指標的比較分析。研究顯示，本論文僅透過三顆LED進行混色，其結果相當接近於自然日光，並且優於市售燈具的表現。

In the past, humans used to follow the natural rhythm of daylight. However, in modern society, people always rely on artificial lighting for most of their time in indoor environments. Artificial lighting in the past only focused on color performance and luminous efficiency without considering the influence of circadian rhythms, which resulted in modern people's circadian rhythm disorders and even caused mental diseases. Therefore, it is very important to develop human-centered lighting systems.
Currently, commercially available dimmable LED lamps can only be dimmed between 2700 K and 6500 K. The new RGBW and RGBCCT light sources have a wider range of color temperature adjustments, but there is no significant improvement in color performance and circadian rhythm, which is far less than that of natural daylight.
Therefore, this study tries to optimize the full color temperature spectrum of daylight in the range of 1800 K to 10000 K by a spectrum fitting algorithm and LED color mixing, with Ra>95 and Duv between ±0.003. Combining optical design, illuminance simulation, and glare calculation, we developed a daylight-like dimmable desktop lamp with the CNS illuminance specifications.
At the same time, this paper compares the full color temperature daylight spectrum with the CIE standard light source, the natural daylight spectrum, and commercially available lamps in terms of light quality, light color, and circadian rhythm factor, and the results of the study show that we have completed a light source that is very close to the natural daylight with only three LEDs, which has a better performance than commercially available lamps.

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