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Hi Kate Ideally levels should not rise above 50 lux and there should be no UV at all, this is recommended for a period of 3 months only. All the best Vicky Dr Victoria Purewal ACR Amgueddfa Cymru-National Museum Wales Department of Natural Sciences Cathays Park Cardiff CF10 3NP Tel +44 (0)2920 573119 From: The Natural Science Collections Association discussion list [mailto:[log in to unmask]] On Behalf Of Kate Eden Sent: 18 July 2014 12:57 To: [log in to unmask] Subject: light levels for exhibiting herbarium specimens Hello We would like to loan some herbarium specimens to a small museum in Dunbar for an exhibition about John Muir. Can anyone clarify what the safe level of light exposure is for herbarium specimens exhibited in display cases? 'Fifty lux (intensity) and 10 microwatts per lumen of ultraviolet radiation' has been suggested. What's the easiest way to measure this, and for what period of time could specimens safely be displayed at this level(they will be covered out of visitor hours)? Thanks Kate Kate Eden Herbarium Technician Royal Botanic Gardens Edinburgh 20A Inverleith Row Edinburgh EH3 5LR 0131 248 2820 http://www.rbge.org.uk/ -- The Royal Botanic Garden Edinburgh is a charity registered in Scotland (No SC007983) YMWADIAD Mae pob neges ebost a anfonir i neu gan Amgueddfa Cymru yn cael ei sganio gan systemau diogelwch awtomatig er mwyn rheoli negeseuon digymell a dileu cynnwys amhriodol neu beryglus. Cafodd y neges hon ei sganio am firysau cyn ei hanfon, ond dylech hefyd fodloni'ch hun bod y neges, a phob atodiad ynddi, yn rhydd o firysau cyn ei defnyddio gan nad yw'r Amgueddfa'n derbyn cyfrifoldeb am unrhyw golled neu ddifrod o ganlyniad i agor y neges neu unrhyw atodiadau. Gall y neges hon ac unrhyw ffeiliau a atodir ynddi gynnwys gwybodaeth gyfrinachol a fwriadwyd ar gyfer y derbynnydd yn unig. Os ydych chi wedi derbyn y neges trwy gamgymeriad, rhowch wybod i ni a chofiwch ddileu'r neges. Safbwyntiau personol yr awdur yw'r safbwyntiau a fynegir yn y neges hon, ac nid ydynt o reidrwydd yn cynrychioli safbwyntiau'r Amgueddfa. Nid yw'r Amgueddfa'n atebol am unrhyw wallau, llygredd neu esgeulustod a allai godi wrth drosglwyddo'r neges hon, felly na ddibynnwch ar y cynnwys heb geisio cadarnhad ysgrifenedig yn gyntaf. DISCLAIMER Email to and from Amgueddfa Cymru - National Museum Wales is scanned by automated security systems to control unsolicited messages and eliminate inappropriate or dangerous content. This message was scanned for viruses before transmission, but you should also satisfy yourself that the message, and all attachments, are virus-free before use as the Museum accepts no responsibility for any loss or damage that might arise from opening the message or any attachments. This message and any files transmitted with it may contain confidential information intended only for the recipient. If you received it by mistake please inform us and delete the message. The views expressed in this message are the personal views of the author and may not necessarily represent those of the Museum. The Museum accepts no liability for any errors, corruption or omissions that might arise in transmission of this message, so please do not rely on the contents without seeking confirmation in writing. -- Scanned by iCritical.