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dc.contributor.authorGibson, ADW
dc.date.accessioned2016-10-27T13:47:23Z
dc.date.issued2015-03
dc.description.abstractWhite LEDs are increasingly being used as sources of illumination for cave photography, both as modelling lamps and as alternatives to flashguns. Clearly, a simple way to determine the effectiveness of such illumination - the guide number - is to calibrate the light source in a series of practical tests. However, we can also determine the guide number theoretically. David Gibson goes through the steps in this exercise, which brings together several aspects of physics and photometry that the reader may have forgotten.en_GB
dc.identifier.citationVol. 89, pp. 13-16en_GB
dc.identifier.urihttp://hdl.handle.net/10871/24119
dc.language.isoenen_GB
dc.publisherBCRA: British Cave Research Associationen_GB
dc.relation.urlhttp://bcra.org.uk/pub/cregj/index.html?j=89en_GB
dc.rightsOpen access under a Creative Commons CC-BY-NC licence.en_GB
dc.titleDetermining the Photographic Guide Number of an LEDen_GB
dc.typeArticleen_GB
dc.date.available2016-10-27T13:47:23Z
dc.identifier.issn1361-4800
exeter.article-numberhttp://doi.bcra.org.uk/j089013.fen_GB
dc.descriptionThis is the final version of the article. Available from BCRA via the URL in this record.en_GB
dc.identifier.journalCREG journalen_GB


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