Parameter: Model:DL-SSSL-50WMain Material:Aluminum AlloySolar Panel Power:18V 60W high efficiency monocrystalline siliconBattery:3.2V 108AH(346WH) LiFePO4 battery,6-8 years lifespanLED Lamp Power:50WBattery lifetime:5-8 years Lumen:8000-9000lmViewing Angle:140º*70ºCharge Time(by sun):6 hours in stro