I found something like this:
"In Europe the headlight must be tilted downward 1%. Sometimes there is a sticker close to the light to inform this. So if you park 3 meters from the wall, then the light must be 3 cm lower at the wall. It's pretty easy to measure with a white paper in front of the headlights. Of course the ground needs to be pretty level"
i will check tomorrow,it looks like my headlight is lowered 15% instead of 1%