... days backup Options for Solar Street Light (WS-SL-S10)Light Power 15W, 18W, 21W, 30W, 42W, ... last up to 50,000 hours, with a 2-year warranty. LED wattage is equivalent to approximately ... 8 years of typical operating life, with a 2-year warranty, automatic operation from dusk to dawn ... 5 ~ 7 years of maximum life, with a 2-year warrantyBenefitsNo line voltage, trenching, or meteringNo power ...