... , Class A cell, conversion efficiency: 16~17%Light Source40W, individual superbright LEDsPole6m, made of galvanized steelController12/24V 20A branded solar charge controllerBatteryGel deep ... CREE brand LED chips from U.S.A. Lighting lumination up to 110~120lm/W. Germany solar controller, IP68 waterproof, protect battery charging & discharging ...