Annual Exposure to Light within Museums

Abstract

THIS paper has the limited purpose of describing how to estimate the annual exposure to light within museums from data on daylight variation combined with measurement of the quantity of light which reaches the wall. To estimate the rate of fading of a colour on an exhibit, or the rate of any other kind of photo-deterioration in the museum, two figures must be known: (I) the rate of deterioration under a known exposure to light, and (2) the annual exposure which the exhibit actually receives from both natural and artificial light. This article is concerned only with the second figure-annual exposure to light. A very great deal is still to be learned, however, about the rates of deterioration of museum material, as is shown by the most recent review known to me which is specifically connected with the fading of old colouring materials [I]. Whereas the illumination values under

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