55W BallastNeed a replacement or spare Ballast for our DIY Retrofit Kits, we've got you covered! These suit both our 2. 5" & 3. 0" Xenon Globes. Sold singularly. Do I need a ballast? If you are upgrading your vehicle's headlights to HID or LED bulbs, you will most likely need a ballast. Ballasts are electrical devices that provide power to the headlight bulb and regulate the voltage. HID and LED bulbs draw more power and require tighter voltage regulation
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