Abstract
Controlling the amount and the duration of illumination, including ultraviolet radiation, is crucial to the preservation of museum artifacts. Ultraviolet-filtered tungsten-halogen sources are commonly used to illuminate museum artifacts, but interest is increasing in solid-state lighting systems because they emit little, if any, ultraviolet radiation and can easily provide different correlated color temperatures and exposure durations. This study examined the potential material degradation impacts of traditional halogen sources and those of a new solid-state lighting system (PL1) designed for illuminating museum artifacts. Using the current Commission Internationale de l'Eclairage model for assessing material degradation, the durations of exposure for a just-noticeable color change for five types of light-sensitive materials at a fixed level of illuminance were calculated for a selection of halogen sources as well as the PL1 operated at six different correlated color temperatures. In addition, color shifts were measured for Blue Wool Standard samples following exposures to halogen sources and to the PL1 set at a correlated color temperature of 3000 K. The PL1 set to 3000 K was comparable to ultraviolet-filtered halogen sources both in terms of the calculated time to a just-noticeable color change and of measured color shift.
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