find_bruce wrote:il padrone wrote:The Luxos B lacks most of the features of the Luxos U, including the panorama beam apparently (puzzlingly) so if he describes the B as being a wide beam, the U is even wider. I'm pretty confident I will be happy with it.
Are you sure ?
Yes. The detailed specs are given for each at the top of that B&M instruction manual that I linked. No "panorama light at close range" is listed for the Luxos B.
find_bruce wrote:Peter White Cycles wrote:These next two photos were taken with the same 45mm focal length lens as all of the other photos. However, the Luxos beam is wider than this lens can capture. So I also took a few shots with a 24mm wide angle lens. They can be seen further down the page. Since even with the 24mm lens, you can't really see how wide this beam is, I then used an even wider lens ... a 16mm (108 degree) wide angle lens ...
Here's the beam at high speed. The Luxos B has the same beam as this.
The Peter White photo clearly shows the uneven light distribution Wouter complains about. To be fair, the "hotspot" of the Luxos U appears to be at least as wide as the full width of other dynamo lights.
Not sure what Peter White means by "the same beam". I really wouldn't mind a "hot spot" that big though (the width of the whole driveway)
[edt] Ah I see now, the panorama beam operates at lower speeds, so the longer range beam IS the same for both the B and the U. But on the U the beam gradually switches to a wide beam as speed drops.
Peter White Cycles wrote:And here is the Luxos U beam at low speed. It reduces the power to the primary LED and sends it to two other LEDs which project light close to the bike and to each side. This happens automatically, and gradually. In other words, there isn't a speed above which the distance beam is on, and just below that the near beam switches on. Oh no. At about 15kph, as you go slower, the distant beam gradually dims, while the near beam gradually increases. It's a very smooth transition as your speed changes.
Close-up Luxos U beam at low speed, taken with super-wide angle lens.