Bhattacharjee and Pal studied the implications of spotlighting paintings in dimly lit rooms with light of different colors. They determined that “the appearance of paintings changes due to different CCTs [correlated color temperatures] of LEDs having the same illuminance. In addition, the result reveals that for both mediums of paintings considered in this study, in comparison to warm white LED and artificial daylight LED, cool white LED has appeared to be more pleasant having moderately warm feelings to the viewers.” The researchers share information about the light directed at paintings: “a warm white (WW) LED (CCT = 2700 K), a cool white (CW) LED (CCT = 3500 K), and an artificial daylight (AD) LED (CCT = 6500 K) with narrow beam angles (10°) were selected. . . . illuminance was set at 100 lx. . . . measurement of illuminance was taken on the center of the vertical plane of the exhibited paintings. The color‐rendering index for all the LEDs was 90.” Artworks were displayed on a black background and the two mediums of art noted above were water and oil.
Amrita Bhattacharjee and Swati Pal. “Effect of Color Temperature on Appearance of Paintings Exhibited Under LED Lighting.” Color Research and Application, vol. 44, no. 5, pp. 762-771, https://doi.org/10.1002/col.22403