Check out supply houses for the film/movie industry or at the local colleges film and art dept. One can get colored sleeves for fluorescent tubes and cut to fit for the incandescent light. Not sure if it will melt from the heat if its higher than 25watts. I know that the film industry use "gel film" for tinting their 1000w spotlights and can handle the high temp w/o melting if wrapped around the light.
HTH
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