Wow, thanks for all the tips. I wasn't expecting all that.
Is it worth going for these 30%/50% extra lamps? Do they get hotter (risk damaging headlamp unit)? I assume that they have similar power requirements to the standard lamps, but are made using better materials?
Any downsides? (other than to the wallet). Last as long? Are they brighter only in one spot?
Seems that Osram or Phillips are the ones to get.
Yet another question... are the "all-weather" lamps good? I'm now toying with putting some of these in the fog lamps, and some 30% in the dipped, keeping mains standard. Probably a waste as I never use the front fogs.
This starting to get expensive, considering it started as "just getting some cheapie spare lamps".