Shiraz University Iranian Journal of Science and Technology Transactions of Electrical Engineering 2228-6179 26 4 2013 02 17 Development of a stand-alone lighting system for 70 W HPS lamps 687 692 1066 10.22099/ijste.2013.1066 EN Journal Article 2013 02 17 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.