Review on DMEX D3S HID Headlight Bulbs Xenon 6000K Cold White 35W Replacement 66340 42403 42302 Headlamp - Pack of 2: Enhanced Lighting Performance by David Dortch

factory replacement for S4 is $200 and auto parts is $150-180. First let me say that they are not as bright as their $200 counterparts, but they are bright enough. I like that they are a bit whiter/bluer than the factory bulbs and it makes the car look better. Be careful when ordering some of these brands as the description is not always accurate. I have ordered 6000K bulbs for both cars and from different manufacturers and they all differ slightly in color temperature although they all state 6000K. Check out the photos people are posting to get an idea of the color temperature.