| Summary: | 碩士 === 國立嘉義大學 === 木質材料與設計學系研究所 === 107 === Light damage of museum object causes material irreversible aging and degradation. It is important to use the proper source of museum lighting. Therefore, evaluating the property of lamps is an indispensable part of conservation work. The main aim of the study presented in the paper was to evaluate museum lighting sources causing color degradation on different materials. Blue wool scale and actual material, including painting and calligraphy paper, mounting materials and Chinese pigments were exposed to four types of white LED lamps with different correlated color temperature and NU-fluorescent lamp. The measurement results provide further information about the benefits of LED lamps for museum lighting.
The result of light sources measurement shows that low correlated color temperature (CCT) type LED characterized lower blue wave band ratio and damage factor. Under 300000 lx∙hr of accumulating exposed time, test result revealed LED lamp with low CCT caused a larger Color change of blue wool scale. For painting and calligraphy paper, mounting materials and Chinese pigments, the test result revealed that Color change by NU-fluorescent lamp was greater than LEDs. The comparison of different Color change by LEDs, machine-made paper fading faster under LED with lower CCT. Conversely, hand-made paper, mounting materials, and Chinese pigments fading faster under LED with higher CCT, and the Color change grows as CCT increase. The results of paper P.C. No. (post color number) values change and pH values are similar to the consequence of color change, namely the lamp which caused Color change lager also caused paper P.C. No. values decrease and pH value decrease. Additionally, some sample reacts with certain wavelengths result in larger fading. It is possible that action spectrum of material receiving.
The relative evaluations of the discoloration degrees of actual materials after exposed of different light sources revealed LED lamps lower than NU-fluorescent lamp and the degrees decrease as CCT decrease. Furthermore, the LED lamps with lower CCT caused less degaradation.
The research verified the blue wave band ratio, damage factor and CCT of light sources as evaluate suitability of light. The LED lamps result lower degradation of materials than NU-fluorescent lamp. It is appropriate to use LED lamp with low CCT as museum lighting.
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