This is a fairly recent test of the available new fangled non-HID bulbs in the UK. Might be useful for folks looking to increase headlamp brightness with little fuss. The 700 FAQ currently only covers the +30% ones.

http://www.autoexpress.co.uk/products/products/212937/make_light_of_winter.html

I have just installed the +50% Philips H4 bulbs (marketed as Philips Power2night +50% in Australia) and they are a terrific upgrade. The difference is quite dramatic. The best thing is the easy nature of the improvement: no wiring or relays to add, no extra wattage to deal with. It's also quite an affordable set of bulbs.

I'll be trying the +80% X-treme series Philips in my 850 soon.

This is good information, thanks for posting. Here in the USA, we are stuck with pretty dim (so to speak) pickings when it comes to bulbs. I have ordered the Philips VisionPlus H4 and H7 bulbs from AutolampsOnline.com, and they mailed the products immediately - excellent service. The VisionPlus were a noticeable but not dramatic improvement over the generic H4 or H7 bulbs. For all the complaints a few years ago about how the Volvo V70/S70 used up bulbs quickly, none of the VisionPlus bulbs has EVER burned out on my wife's 1999 V70.