Further progress, however, with deficits

I'm going for years with LED headlights on bicycles, because I am also regularly out at night. The IQ2 Luxos is again an improvement over its predecessors. In particular, the illumination of the sides is clearly better. As homogeneous I would not describe the light, however. There is but from different segments and also bright stripes, which actually is not optimal for the adaptation of the eye (-1 *). The light output is sufficient, however, to advance easily recognizable on about 100m all. That should, however, only as high set if you do not have two-way traffic. Too bad that the latching quick adjustment of previous B & M LED headlight (IQ Fly) was abolished. The button on the handlebars I find very useful. A big advantage is that you have very good even in the parking light (if one remains standing for eg game). Conclusion: If you drive a lot in the dark forest and wildlife-rich stretch, will feel more confident with this light.

Supplement dated 27/07/14 for USB charging function:
With the current technical solution probably be few users who want to upload their smartphone on longer trips, be satisfied. Why? Even B & M (the manufacturer) is recommended rather to earn its "E-Werk" for this purpose. The reason is simple: A standard dynamo delivers 3 W, ie 500-600 mA, but most smartphones approve significantly more than 1000 mA, if you are offered it. And here is the manufacturer of "IQ2 Luxos" must rectify, that is, if they do not limit the current to 500 mA to the USB port, the connected equipment draws logically the buffer battery in the spotlight yet. This is what happens even when I connect my Sony Z1 Compact. After about 10 minutes it reported then "Charged", again "connected charger" a few seconds later, etc. As a result, the display will always be only slightly loaded in operation and the battery, perhaps permanently damaged. But I draw from another star.
A correspondence and call the hotline of B & M only led to the recommendation that I should but the headlights submit for review. (Following statement?)
I have currently found another solution that works very well so far: A small Power Bank (LogiLink 2200 mAh, for EUR 6 from Voelkner) with USB ports I switch between headlights and Smartphone. The whole course gives an additional wiring, but you do well (including Smartphone) into a top tube bag can accommodate the bicycle.
Conclusion: For the MSRP of 179, EUR, I would not buy this product. Who is rarely at night go to should also save this issue.