We recently purchased TL 70 series fluorescent lamps (bulbs and tubes) for our museums and will be used in all of our exhibit spaces. I asked the manufacturer, Philips Lighting, what the UV output of these bulbs are and they answered "The UV wavelength is 400-700 nanometers which is visible light." The problem is that the museum literature I have on lighting refers to "microWatts per lumen" or mW/l.  Does anyone know how to calcuate the nanometers into mW/l so I can really understand how much UV is being emitted by these new bulbs? I assume that I need to put a UV filter over each bulb. Thanks for any help!

Mary Ames Sheret
Curator of Collections/Exhibits
Southern Oregon Historical Society