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HID Lighting
HID Conversion Kits: Systems, Bulbs, Ballasts & Harnesses
Halogen headlights that go dim and yellow with age are usually what sends someone looking for an HID conversion kit in the first place. Once you know you want HID, the real decision comes down to ballast wattage, a 35W system or a 55W system, since that choice drives everything else about the kit: which housings can safely take it, how bright the output ends up, and even how the color of the light looks once it warms up.
Kelvin rating is what determines the color of an HID bulb, and you should decide how you want your headlights to look rather than chasing the highest number available. 4300K produces a bright white light with a slight yellow tint closest to factory halogen, 5000K to 6000K lands in the crisp white range most drivers want, and anything past 8000K starts sliding into blue and eventually purple, which looks striking but throws less usable light on the road. Ballast wattage complicates that choice because a 55W ballast runs hotter and pushes roughly 20 percent more lumens than a 35W ballast, and that extra heat and output can shift the same rated bulb slightly further down the color spectrum than it would run on a 35W system, so a 6000K bulb on a 55W ballast can look a bit warmer than the same bulb on a 35W setup.
Shop HID by what you need
HID Systems
Complete kits pairing matched ballasts, XB HID bulbs, and wiring for drivers doing a full halogen-to-HID swap in one order.
HID Bulbs
Replacement xenon bulbs with Philips quartz glass for anyone already running HID who just needs fresh bulbs in an existing kit.
HID Ballasts
Standalone 35W and 50W ballasts for rebuilding a failed system or matching your projector's rated wattage.
Wire Harnesses
Relay and Standalone Canbus harnesses built to carry HID current safely and keep factory circuits free of dash errors.
Confirm your bulb size and ballast wattage against your projector or housing type before you order, mismatched fitment is the most common reason parts come back.
Go deeper
- High Intensity Discharge Lighting: How HID Xenon Headlights Work
- What Does the "K" Mean in HID Kits?
- Which HID Color Is The Brightest
- HID Relay Harnesses Explained
- Mount the Ballast Correctly
- What Is the Best D2S HID or LED Bulb? (2026 Buyer's Guide)
- HID Conversion Kit Troubleshooting Issues
Frequently Asked Questions
What kelvin rating should I choose for an HID conversion kit?
4300K to 6000K gives you a whiter light with better visibility in rain and fog. Anything above 6000K shifts toward blue and eventually purple, which looks different but performs worse in bad weather and low visibility conditions.
Does a higher kelvin rating mean a brighter bulb?
No. Kelvin rating describes color temperature, not brightness. A 5000K bulb and a 10000K bulb can produce similar lumen output, the difference is the color of the light, not how much of it there is.
Can I use a 55W ballast in any housing?
No. A 55W ballast should only go into a large reflector or a projector rated for it, such as a mini D2S projectors. Putting a 55W ballast into a smaller projector like the mini H1 or a fog light housing risks melting the reflective coating from the added heat.
Do I need a full HID system or just replacement bulbs?
If you already have a working ballast and harness, replacement bulbs are all you need. If you are converting a halogen housing to HID for the first time, a complete system with matched ballast, bulb, and wiring is necessary.
