Risking the appearance (confirmation?)that I'm completely mathmatically incompetent, I pose this question: "How do I convert data from a UV meter that gives readings in microwatts per square centimeter to a reading of microwatts per lumen (the unit of measurement referred to in most collections care literature)?" Thanks for your help. Chris Hanson Curator of Collections Ketchikan Museums ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).