Research On Lighting Index Of Museum Exhibition Based On The Evaluation Of Color Damage Of Light Sensitive Cultural Relics

Light sensitive cultural relics are the most sensitive type of light in museum lighting.Under light conditions,it is very easy to produce fades and discoloration.In order to reduce the damage of museum exhibition lighting to cultural relics,the lighting standards of museums are strictly limited to illumination,CCT and exposure.However,there are still problems in these three indicators in the museum standards,making it difficult for cultural relics to achieve the best result in the museum or the best protection.According to the characteristics of light sensitive cultural relics,it is concluded that the illumination,CCT and exposure amount suitable for lighting different vulnerable cultural relics are the key issues to be solved urgently.With the rapid development of LED,its spectral adjustable characteristics are applied to museum exhibition lighting,but it also increases the difficulty of museum exhibition lighting research.At the same time,light sensitive cultural relics are rich in pigments,while different kinds of pigments have different absorption and reflection properties in visible bands.Therefore,it is of great significance to make clear the damage effects of different visible bands on different kinds of cultural relics.For the problems existing in the museum lighting standards,this study will use 10narrow-band light sources to conduct equal radiation experiments on 7 organic pigments and 17 inorganic pigments commonly used in light sensitive cultural relics,and quantify the radiation damage to cultural relics by color difference method.According to the composition of different kinds of light sensitive cultural relics pigments,the damage coefficients and damage functions of cultural relics in different bands are obtained.In order to get the best CCT of different kinds of cultural relics display lighting,this study uses exhaustive method to fit all light sources with 10 narrow-band light sources,and obtains 9477 SPDs which meet the requirements of visual.Combining the relative damage coefficient of different narrow-band light to cultural relics,the relative damage value of SPD to different kinds of fragile cultural relics is calculated,and the average relative damage value of different color temperature sections is calculated.The CCT of light source which meets the visual requirements and minimum damage is obtained in the display lighting of different kinds of sensitive cultural relics.In order to get the best illumination of different cultural relics display lighting,this study will be based on the damage function of each narrow band light to cultural relics.We calculated the color damage values of 9477 SPD by 50 lx,100lx,150 lx and 200 lx for four consecutive years,and then judged the damage effects of different illuminance on cultural relics.Then we got the scientific illumination range of different kinds of light sensitive cultural relics.In order to obtain the optimal exposure of the exhibition lighting of cultural relics,based on the damage function of each narrow-band light to different cultural relics,this study calculates the corresponding exposure of 9477 SPD to the color damage of cultural relics when E*ab=5,and takes the mean value of the exposure,and obtains the scientific exposure of the exhibition lighting with different light sensitivity.This study obtains the illumination,CCT and exposure of exhibition lighting of different light sensitive cultural relics,which provides theoretical basis for revising the lighting standards of museum exhibition,and is of great significance for reducing the damage of visible radiation to cultural relics.