Ballast: The ballasts have been improved to require less current on startup to protect the factory wiring and to extend the life of the bulb by not forcing too much power to it at once. Ballasts can also provide constant power to older bulbs which require more voltage to ignite. Output frequency is 250HZ, reducing the chances for electronic feedback which can cause humming in improperly grounded audio systems. These ballasts are virtually bulletproof and are designed to last 10-15 years.. Bulbs: Our Premium Ultra HID bulbs are quite simply the best. . On top of this we've redesigned the capsule to produce up to 20% more light than the standard Apexcone HID bulbs which are already an industry leading bulb.. Kit Includes: 2 x Ultra D4R / D4S 35W HID Ballasts 2 x Ultra D4R / D4S HID Bulbs.
