Abstract
Light causes damage when it is absorbed by sensitive artwork, such as oil paintings. However, light is needed to initiate vision and display artwork. The dilemma between visibility and damage, coupled with the inverse relationship between color quality and energy efficiency, poses a challenge for curators, conservators, and lighting designers in identifying optimal light sources. Multi-primary LEDs can provide great flexibility in terms of color quality, damage reduction, and energy efficiency for artwork illumination. However, there are no established metrics that quantify the output variability or highlight the trade-offs between different metrics. Here, various metrics related to museum lighting (damage, the color quality of paintings, illuminance, luminous efficacy of radiation) are analyzed using a voxelated 3-D volume. The continuous data in each dimension of the 3-D volume are converted to discrete data by identifying a significant minimum value (unit voxel). Resulting discretized 3-D volumes display the trade-offs between selected measures. It is possible to quantify the volume of the graph by summing unique voxels, which enables comparison of the performance of different light sources. The proposed representation model can be used for individual pigments or paintings with numerous pigments. The proposed method can be the foundation of a damage appearance model (DAM).
Highlights
Optical radiation is electromagnetic energy that dissipates through space
Sample calculations demonstrated the use of the proposed method to high5
The discretization of continuous data can enable the quantification of the performance of multi-primary LEDs in the context of art conservation
Summary
Optical radiation is electromagnetic energy that dissipates through space. The visible part of optical radiation, upon reaching the surface of an object is either reflected, transmitted (if the object is transparent or translucent), or absorbed. Reflected light initiates vision when it is detected by the human visual system. Light absorbed by the object turns into heat and is considered wasted for illumination purposes. The absorbed light (energy) may cause a chemical change in the molecules due to photochemical reactions, and if the object is light-sensitive, such as a painting, it may cause irreversible damage (e.g., color fading) [1,2]. The dilemma between visibility and damage is a crucial aspect of lighting design for museums and galleries
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