Hello all: I am writing to clear up some confusion about the UV output of halogen light bulbs. I had an inquiry from a friend who runs a small, but respectable, private quilt museum behind her antique shop in a small town near here. She really does a good job at maintaining high standards and is conserned about conservation, etc. She called to tell me that a visitor this morning told her she needs filters on her halogen flood lights in the museum and that she was ruining her quilts. She wanted to know what I knew about halogen. My initial response to her need for filters was "nonsense." Her flood lights are about 20 ft. from the textiles on exhibit (so heat is not an issue), and I'd say the light level is about 10 footcandles. The lights are only on when there is a visitor to her museum room, and she rotates her exhibits every few months. But then I thought about it and curiosity made me look it up in some reference materials and I discovered from a chart that tungsten halogen bulbs produce as much UV as fluorescent bulbs. I also checked the Consdist List archives (CoOL) and could find scant information there, but what I did see hinted that halogen bulbs might actually be better than fluorescent for UV output. The Museum-L archives had nil (that I could find) on this topic. So.... 1. Do tungsten halogen bulbs put out more UV than regular incandescent bulbs? As much as UV as fluorescent? 2. Are all halogen bulbs tungsten bulbs? If there is such as thing as non-tungsten, are they better or worse? 3. Can anyone recommend a cheap source for UV filters? If she does need filters, perhaps it would be better and cheaper to just replace the halogen flood bulbs with regular incandescent flood bulbs. Can anyone help? Thanks! Christine Mouw Assistant Curator Herbert Hoover Presidential Library-Museum West Branch, IA 52358 [log in to unmask]