It would seem that on the standard boxster Porsche provide the Bi-Xenon lights in the UK as standard. But to save pennies, they have found a way of providing these lights with NO headlamp washer and that has resulted in a 25 watt arrangement to make them legal, as opposed to a 35 or even 55 watt package, as found in normal high wattage Bi-Xenon lights.
The net result is a low output and dim light. Its almost ok in dry conditions, but on wet and shiny roads, normal xenon lights just light up the road and these are completely lost
The bulbs are a DLS variety and no one makes an upgraded bulb yet !