voltage 6-20 volts dc start method instant start with rich industry experience & knowledge, we have been able to provide the best array of dc led driver, solar led driver, dc-dc led driver . Constant current led driver dc-dc led driver . 4-12 watts . Efficiency 92% vout max 24-26 vdc. Current 150-600ma metal core pcb used. Dusk to dawn functionality. 2 years warranty. applications : dc solar bulb . dc solar tubelight. dc solar streetlight. dc slolar light.