Digital 55w Slim Ballast

Why do I need a Hid ballast? 
Ballast is essential in HID kit of parts. Its main role is to increase the original instantaneous voltage of 12V to 23000V high pressure, 
the use of this high-intensity HID bulb voltage activated between two poles produce intense light, lighting the lamp to achieve high brightness. 
Specifics: 
Voltage Input: 12V 
Power Output : 55W 
Working Current: 2500-3500Im 
Case Temperature: -40℃±105℃ 
Service Life: More than 5,500 hours 
Compatibility: Car, motorcycle, electric motor car 
Item Weight: 0.88lb 
Package weight: 0.97lb 
Package Dimensions: 5.7x3.7x3.2 inches 
Bulb Type:H1,H3,H4,H7,H8/H9/H11,9005/HB3/H10,9006/HB4 
Package includes: 2 x Xenon HID Ballast