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.
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