2009 c class hid low beams

We have recently had a low beam go out on a 2009 Mercedes c300. We went to local parts store to purchase bulb. However when we got home and popped the hood it appears that there are HID lights in this car and are unable to find any diagrams, instructions, or videos showing how to change these. We are at a loss but need a headlight as our low beam is not working on the passenger side at all.