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The HID Retrofit Specialist
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HID Ballast

All HID retrofits are dependent on the ballasts, which is the part that "turns" on  the HIDs. In essence it up-converts the automotive voltage to roughly 25,000V,  which excites the xenon bulbs. There are different ballasts available and they  come in different prices, sizes and with different igniter cord lengths. The igniter  cord connects the ballasts to the igniter cap, which is twisted onto the back of  the projector/bulb. The length of the igniter cord can become a real significance, when too short of a cord may prevent you from installing the ballasts in certain  location. The cost ranges between $75 to $200 per pair, where the average cost is  around $100/pair.