Detailed Product Description The ballast in an HID lighting system generally has two purposes. It provides the proper starting voltage to strike and maintain the arc, and also they can regulate the proper current to the lamp once the arc is established. Ballasts are not inter-changeable among different types of HID lamps. A ballast design incorporates electronic circuitry to provide specific lamp and ballast's operating characteristics. Specification Input voltage: DC8. 5V-12. 8V, DC10V-15V, DC9V-16V Input current: 1. 0A, 1. 9A, 3. 2A Output Wattage: 10W, 21W, 24W, 35W, 50W Features Energy saving High power factor High reliability No flicker Option: Under 150W, various ballast also available.