I have noticed that the low beam is weak to the extent that if there is a car behind me, there will be a shadow in front of me.

Tried several types of bulbs and the same problem, so decided to change the projecter lens since they have not been changed for 11 years ( the car is 2007 ).

Heard that the Q5 projectors are good and bright, but can not find the site to get originals ones.

First, how many inches the factory is?
Second, do you recommend specific type of projector lens?