Development of a stand-alone lighting system for 70 W HPS lamps

Abstract

A stand-alone photovoltaic lighting system is reported in this paper‏.‏‎ ‎The system uses a 70 W HPS lamp with a DC bus voltage of 12 V. An efficient ‎electronic ballast, which makes possible the use‏ ‏of 70 W HPS lamp in ‎photovoltaic applications is reported. Design of the ballast is‏ ‏discussed‏. The ballast has ‎an efficiency of more than 87 percent for the operating load range. ‏The ‎performance of the HPS lamp with the electronic ballast is reported and ‎compared with passive ballast.