Light wavelength, intensity, and duration contribute collectively to the rate of material degradation in exhibitions. The intensity of visible light in the display space should be low enough to avoid object deterioration, but bright enough for viewing. A patron’s tolerance of low level illumination can be aided by reducing ambient light levels to a level lower than that falling on the exhibit. Visible light levels should be maintained at between 50 lux and 100 lux depending on the light sensitivity of objects. An items level of toleration will depend on the inks or pigments being exposed and the duration of the exhibition time. A maximum exhibition length should initially be determined for each exhibited item based on its light sensitivity, anticipated light level, and its cumulative past and projected exhibition exposure.