Im not sure if you're talking about the actual act of physically adjusting your headlights or how they should be properly aimed, but I'll leave this picture for you and anyone else That I found on HID Planet when I was researching how to aim after my retrofit
- Red line is the height from projector to ground.
- Blue line represents the DOT standard 2.1-2.5 drop. You can go as low as a 3in drop, as thats European Standard, but I personally wouldn't.
*Take all this with a grain of salt if you dont have a tabletop flat cutoff line*