Abstract: A solar powered lantern device is visible even without a beacon under reflected light and can be easily color coded to conform to the marking requirements of a new location. The lantern device includes a housing, a lighting element supported by a luminescent internal frame, a photovoltaic power supply, and an omnidirectional reflector. In particularly preferred forms, the lantern device is a buoy having a modular housing with interchangeable colored elements. A lighting element is centrally supported inside the housing by a luminescent frame, which serves to reflect light from approaching craft when the lighting element fails. The device may also be mounted atop a pole. In preferred forms the frame is hollow and forms a conduit for electrical conductors from the power supply to the lighting element. A pair of conical reflectors is positioned within the housing to reflect the beacon light omnidirectionally.