Examination of white led lamps and conventional museum lamps when used against textiles dyed with natural dyes
The effect of photodegradation of five types of white LEDs with different correlated color temperature (four dichromatic white and one trichromatic white) was examined by exposing them to blue scale standards and silk fabrics dyed with 22 kinds of natural dyes in order to assess their use in museums as exhibit lighting. Variations of chromaticity of the exposed surface of each sample were measured at every 15000 lx hr exposure ( 500 lx × 30 hrs), and CIE 1976 L*a*b* color differences from the original state (0 hr exposure) were calculated. The exposed color differences of white LEDs were evaluated and compared with results of a previously reported experiment earned out with fluorescent lamps.Dichromatic white LEDs (blue LED + yellow phosphor) caused less degradation than trichromatic white LEDs (UV LED + tri-phosphors) and conventional white fluorescent lamp, both of which emit UV radiation. The irradiance causing the color difference △E = 1.6 (minimum noticeable color difference) with 2869 K dichromatic white LED of blue scale grade 1 (most fugitive) was approximately equal to that of fluorescent lamps used in museum and art galleries (NU/3000 K). The discoloration tendency of natural dyes with 2869 K dichromatic white LED was also the same as the NU fluorescent lamp. However as the dichromatic white LEDs have a high peak in the spectral distribution of 400-500 nm and 500-600 nm, their effect on accelerating the fading of yellow dyes should be investigated further when applied as museum lighting.
white LED lamp exhibit lighting natural dye fluorescent lamp for museum and art gallery
Ishii, Mie Moriyama, Takayoshi Toda, Masahiro Kohmoto, Kohtaro Saito, Masako
Kyoritsu Womens University Toshiba Lighting and Technology Ltd. Technologe Ltd.
国际会议
26th Session of the CIE(国际照明委员会（CIE）第26届大会)
北京
英文
496-499
2007-07-04（万方平台首次上网日期，不代表论文的发表时间）