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Nanowires as an active medium are promising for getting high brightness light emitting diodes. Semiconductors such as GaN and ZnO grow as nanowires with a hexagonal cross section and their optical properties have been little explored. We study important properties for nanowire LED optimization. In particular we review the modal properties of hexagonal nanowires and compare them with those of circular nanowires. We also study the modal reflectivity of guided modes at nanowire end facets and explore the relevance of a comparison with plane-wave reflectivity. Finally we analyze the distribution of the emitted power in three different cases: a single point emitter and an axial and a radial nanowire heterostructure.