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Are there any signs of the connections to the headlights getting hot?.Poor earth connections are not uncommon,and will cause the light effected to be dim,and eventually the wiring will melt.
Also,make sure that both the reflectors in the headlights are still in good condition.
If all seems well,then you have to suspect a faulty bulb.I'd change back to the standard ones and see if there is still a difference.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo