Optimizing spectral distribution character of the LEDs to decrease   discoloring of the collections in museum
  For white LEDs used for lighting museums, it is possible to reduce their effects on the discoloration of exhibits to a great extent by regulating their spectral distribution so that less lights with 420~470 nm of wavelength which acts on increasing the span of preservation of exhibits, such as pictures, color paper and color cloth. For same illumination of radiation of 5000 lx of white LEDs with different color temperature of about 3000, 3200, 4200 and 6500 K, the density of radiation energy of 420 nm was 34.2, 71.8, 83.1 and 268.3 {\mu}W/cm2, respectively. The discoloration experiment shows that the effects of discoloration of cold white LEDs was much greater than those of warm white LEDs. 
Chang Ho Kim, Hong Wei Liang, Sung Hyok Han, Ju Yong Kim, Ki Won   Ryang, Chol Kim
physics.pop-ph