I've done the forum searches and know where the adjustment screws are for the HID headlights. Only question I have is which way do you turn the screw to adjust left and right. The previous posts weren't too clear IMO. My driver side one is currently pointing a little too far left, its noticeable when looking at the lens assembly.

 

It's located a couple inches further away from the vertical adjustments, almost up against the fender. Check this out . I believe the video was posted by a CL member as well.

 

On my IS there's only one screw? For up/down... might be mistaken

 

Apparently that's the case for halogen lights.