The essential features of a fluorescent binary light curve model are described. The model applies to a wind and chromosphere irradiated by a hot companion, and is particularly aimed at symbiotic stars. The treatment is in terms of the combined light of all emission lines within a photometric band, rather than individual lines. The model wind is ionization-bounded and the model chromosphere is characterized by a density scale height. Eclipses and shadowing of wind and chromosphere by the stars are included. Photospheric continuum radiation also is included, as in standard binary star light curve models. Solutions are best done both subjectively and objectively, and in time rather than phase so that ephemeris parameters can be found together with light curve parameters. An application to symbiotic nova V1329 Cygni is briefly sketched and the main solution problems are outlined. Surprisingly, a large period change was found at about the 6σ level, although it needs independent confirmation. Simultaneous fitting in U, B, and V has led to insights regarding periodic variation in this binary. Further specifics and numerical results will follow in a longer paper.