I don't really understand this thread!! Please explain your question in better detail. First off, by "overhead projector" do you mean the transparency projector type whereby a sheet of clear acetate is used on a glass platten/Fresnel lense? Or are you referring to a data/video projector that uses LDC or DLP technology? I gather that you are trying to substitute a lamp for a blown fuse? If so, typically a 60w incandescent lamp is temporarily wired in place of the fuse.