Some cars, Ford and VW Group, but not all model/trims are fitted with lower output bi-xenons which use a 25w bulb rather than 35w or higher - this lower light output (2000 lumens) allows cost savings as levelling and headlight washers aren't a legal requirement.
I've been caught with my new VW Touareg as it gets 25w bi-xenons as standard so I didn't tick the extra cost option box for 35w bi-xenons. The light output is worse than my previous Hyundai Santa Fe which had standard halogen bulbs but I'd fitted legal high intensity 100%+ bulbs.
The 25w D8S bulbs can be changed for 35w D3S - BUT - the bulb base cut out needs enlarging to seat properly and - MAY - not suit the beam pattern - this has been done by a Focus ST owner.
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