Have in my golf Philipps lamps had either the VW dealer or even the first of 2009 I've never changed this. The difference was immediately visible to the naked eye in the garage. However, I once asked my lux meter in the beam and measured at the original 1326Lux in 3,2m distance. The Bosch 90 1890 Lux have thus already a significant difference. Of course this is very amateurish attempt, however, has confirmed my impression.
The bulbs are just super and who attaches great importance to a good and bright illumination, lies with the Bosch right.