Gloucester County Historical Society wrote: > > I am director of a museum that's currently being rewired. I am > familiar with plastic sleeves put over florescent lights to cut down > on UV. How can I filter UV from light coming from incandescent > lights? I mean table lamps, track lighting, chandeliers, etc. There > is new UV blocking film on the museum's windows, too. Thanks for your > advice. Before investing in filters, have you calculated whether there is an appreciable UV component to worry about? For common incandescent filaments, the UV component is very small, and can be lessened by running them at lower temperatures (e.g. by using lower voltage supplies.) In fact, if you analyse the spectrum of common incandescent light, you'll find that most of it is invisible and harmless infra-red. So it might be worth checking whether the filaments in use do in fact present a problem. If you have a pre-determined standard threshold for tolerable UV exposure, then it would probably not be very difficult to calculate a sufficiently accurate estimate of whether the threshold is exceeded. A good student of 2nd-year university physics should be able to do this with little difficulty, given some spatial data about your museum. ----------------------------------------------------τΏτ- Alistair Kwan - [log in to unmask] / [log in to unmask] -------------------------------------------------------- ========================================================= 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).