Originally Posted by
noisebeam
Have you checked how wide the 65 beam is on a wall or similar? I found it to create a 10'+ diameter circle even 10' back - worse is the center part is much dimmer than SF regular or turbo. So wide it the thin circle of brightness will be out of sightlines even on a very curvy road. The standard/turbo SF beam is not really that narrow either when tested against a plain wall from 30' back, at a 100' back it is wider than a 3 lane road.
When I store my bike inside my condo, the taillight shines on the door about 3 feet away, I can see the beam shape quite well from that.
I live next to a small park. Initially I was worried about the 65 for the reasons that you cite, but I put both my plain Superflash and my Superflash 65 in flash mode on my rear patio on a sunny day. Walked across the park and I could still see both lights at quite a distance, and if I walked around so that the angle changed, I was still happy with how bright the 65 was in flash mode.