2002-2006 Chevrolet Avalanche 1500/2500 w/Body Cladding Right Passenger Side Fog Light

HID stands for "High Intensity Discharge". These bulbs use an electric arc rather than the glowing filament in a Halogen bulb. HID headlamp bulbs do not run on low-voltage DC current like a Halogen Bulb, so they require a ballast, which controls and regulates the flow of current. This ballast will require an ignitor to light the bulb. This is either integrated directly into the bulb or as a separate unit which is occasionally part of the ballast, similar to fluorescent bulbs in your home. In a vehicle, HID bulbs tend to be much more expensive to replace than a Halogen bulb.

Installing new headlights on your vehicle can result in fitment issues if they are improperly installed. Many times an alignment post is not inserted correctly, or a bracket is not tightened to the correct torque. In other cases, the incorrect part is being installed. We want to know if you have any installation issues with your new parts as soon as possible, so that we can help you figure out exactly what is wrong. Please contact us so we can help you save time with any questions you might have if something does not appear to fit correctly..

For the most part, no. The stock replacement headlight assemblies are a direct equivalent to what is being taken out of the car. You can reuse your old bulbs and sockets, which should fit right in with no modifications needed. Some of the aftermarket units do use different Halogen bulbs than the stock ones. In those cases, we sell the requisite bulb, and really, with the great deal we have on PERDE light bulbs, you can't go wrong with fresh, new bulbs.