Hi annirak,
That's a really interesting post showing clearly the beam patterns and the difference between the two. I think that's a really useful visual example and really helpful to give anyone a good visual aid as to what to expect from the light and what will suit them best.
I'd say that with respect to my recommendation that I'm not a professional tester nor to I work in the cycle media as I’m just an ordinary everyday cycle commuter and can only speak from the experience of the lights that I've had.
I'm still happy to recommend the Trelock LS 950 because speaking just from personal experience it's the best ever headlight that I've had to date and the strength of the light and the length of the battery. The buttons are also easy to use and I can change between settings with gloves on which i like. However I've not tried loads of lights so I'm sure that others can find other lights that suit them better and that's the great thing about these forums because you can get loads of feedback from people who have real world use over a prolonged period of time as opposed to a tester who gets to use it for a relatively short time.
On my daily commute I do find that the Trelock LS 950 out performs the majority of other lights that i see others using. There are some other with arguably more powerful output spread over a greater field but I think that sometimes I'm blinded by people coming towards my with MTB lights throwing light all over the place whereas I think that one good thing about the Trelock is it is designed for road use and I think that in Germany they have fairly strict laws which govern beam patterns/directions etc.
Whilst thinking about beam patterns there are some good examples on this website although quite a few of the examples are slightly off the OP topic because lots of the ones featured on this website are dynamo lights as opposed to battery powered ones.
http://www.peterwhitecycles.com/headlights.asp
Anyway I think that the example of the light from the Ixon IQ looks very impressive and I hope that all of the posts help the OP to find the right light for them because there are different lights out there that will suit different people according to their circumstances and use.
Thanks,
John