博物館選用LED光源色溫之探討

A Study on the Consideration of the Correlated Color Temperature of LEDs for a Museum

發光二極體（LED）近年逐漸成為主流燈具。本研究試圖從文物保存角度出發，介紹LED光源重要參數，包括色溫、色容差，以及演色性等博物館照明特別關心的燈具性質。隨後，我們分析LED燈具之光譜，並且計算各燈具的哈里森傷害因數；同時定義光譜藍光波段成分比例，以作為判斷LED照明潛在傷害的參考。我們發現藍光比例除了會隨著燈具色溫升高而增加以外，藍光比例與燈具的傷害因數亦顯著相關。對於相同色溫的燈具，若是其演色性較高，則藍光比例隨之下降。最後，我們藉由LED燈具的測量與調查，試圖建立起不同色溫範圍下，合理的藍光比例規範建議，以作為博物館選用LED燈具之參考。

Recently, light-emitting diodes (LEDs) are popular in the aspect of lighting. Based on the viewpoint of conservation, this study plan to introduce some important parameters of LEDs, including the correlated color temperature(CCT), the color tolerance adjustment, and the color rendering index(CRI). These properties are important for the museum lighting. Then, we analyze the spectra of the LEDs and calculate the Harrison damage factors. To establish a reference to the lighting damage, the blue wave band ratio of LEDs is defined. The ratio grows as the CCT increases, and it is significantly correlated with the damage factor. Besides, for the LEDs with the same CCT, the ratio decreases with the CRI. Moreover, according to the obtained data, the appropriate ratios to several CCTs are suggested for the museum lighting.