... Ballasts have two different types, Analog, & Digital. And two different sizes,Standard & Slim.Slim ballasts are ... where the electrical system is very simple, and where it does not matter if ittakes a ... high-low-voltage lights out> 30V, <8.5VHigh and low pressure to start> 30V, <8.5VSteady-state ... .4V) High quality and competitive price 12V 35/55W Standard HID slim xenon Ballast with CE,E-mark certificate