Hi Gail,
According to The Museum Environment by Garry Thomson, ordinary "tungsten
lamps emit too little UV to require a filter."  Tungsten-halogen, tungsten-
iodine, quartz-halogen and quartz-iodine emit UV in a wavelength less than
300nm.  "This is very potent and must be eliminated.  Fortunately, ordinary
glass, transparent to longer-wavelength UV, completely blocks this extra-
short emission."
Fluorescent lamps on the other hand must all be filtered for UV.  Hope this
helps.
Sincerely,
David Ryan
Registrar
Colorado Springs Pioneers Museum
www.cspm.org

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