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Universidade do Porto Faculdade de Letras da Universidade do Porto Serviços de Documentação e Informação
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Lights on... Cultural heritage and museums!
#Managing natural light in historic properties
David Thickett
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#Abstract
Natural light is an essential feature of many historic interiors and significant views from rooms must often be retained. This paper will detail procedures developed to manage it and also elucidate the negative effect it can have on showcase performance and solutions. Light plans have been developed to manage daylight. Monitoring natural daylight is challenging and blue wool dosimeters have been adopted. The preparation and measurement of these can significantly affect results and improved procedures have been developed. Monitoring of three hatchments at Lyddington Bede House indicated that in the position the hatchments, light and UV were sufficiently controlled by the stained glass in the windows. Mesh materials and neutral density films have been used to retain views whilst controlling daylight. Within English Heritage's estate many historic properties contain showcases. Careful design is required to ensure adequate performance environmentally. In such situations the room environments are frequently far from ideal and showcases are often required to perform environmental remediation for safe display of their contents. At St Peters church the surface temperature of archaeological bone displayed in showcases under stained glass windows found to have significant daily increases with predicted damaging decreases in surface RH. Simple geometry can indicate when direct sunlight can fall on showcases, mobile apps can dramatically reduce the time needed for calculations. Daylight even filtered through double blinds can affect some sensitive environmental control equipment. Examples of problems encountered and solutions will be presented. Light can dramatically increase off-gassing from showcase materials. At Apsley House allowing too much daylight onto showcases containing supposedly light insensitive objects chemically degraded the woolen display fabrics dramatically increasing the silver tarnish rate.
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Data da última atualização: 2021-02-24

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