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The evaluation of the physical parameters or effects such as the luminosityfunction (LF) or the photometric maximum (PM) for galaxies is routinely modeledby their spectroscopic redshift. Here, we model LF and PM for galaxies by thephotometric redshift as given by the Spitzer Wide-Area Infrared Extragalactic(SWIRE) catalog in the framework of a lognormal LF. In addition, we compare ourmodel with the Schechter LF for galaxies. The adopted cosmological framework isthat of the flat cosmology.

A lognormal luminosity function for SWIRE in flat cosmology