2014 年 98 巻 11 号 p. 585-592
To evaluate the performance of white LEDs as museum lighting, the authors have conducted research and reported on the effect of illuminance level and color temperature on textiles dyed with natural dyes. In this research, four additional white LEDs with various correlated color temperatures and different material constructions and three types of conventional fluorescent lamp were tested yellow textiles that were sensitive to light and ranked in the highly responsive category of the CIE Technical Report (CIE-157-2004) for blue and red dyes. The color degradation degree caused by white LEDs was almost larger than that caused by conventional NU fluorescent lamp. Among the white LEDs, the degradation degree was LED/D (7483K) > LED/UV+RGB (5265K) > LED/B+YAG (5098K) > LED/L (3633K). For the same illuminance level when the content of the 400-500 nm radiation became larger, the degradation degree became larger. When the correlated color temperature was the same, the degradation degree was larger with LED/UV+RGB than with LED/B+YAG. The acceleration degree of degradation differed depending on the LED construction (combination of LED chip and fluorescent material) . From these results, it can be determined that for introducing white LEDs to museum lighting, not only the annual maximum exposure but also the material construction (combination of LED chip and phosphor) should be considered.
