A bit of a meander, but still on the subject of Xenons....
My new (FL) S8 has standard Xenons with filament main bulbs.
My first observation is that the main beams seem a lot brighter than on my PF S8. 
However, being rather more observant I noticed that when switching back to dipped the filament bulbs went out and a fraction of a second later the Xenon beam pattern changed, with a sharp top cutoff (as normal).
So is there also some sort of moveable shutter in there that means the xenons also have a higher beam when not dipped?
My PF S8 the dipped Xenon beams are definitely not changing at all when switching.
Another difference that I've read is that PF xenons have "static" levelling set at start-up whereas my new one has the "dynamic" version.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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