I use mine for daytime visibility, and in the 1 pulsing mode it gives me 6 hours of battery life, adequate for most of my rides. It seems plenty bright. I bought extra mounts for about $10 and put one mount on each bike. The mount worked nicely on the seatpost of one bike, but when I mounted it on the other bike's seatpost there was insufficient clearance under my seatbag to slide it upwards to remove it. So I had to attach the mount upside down on one of the seat stays, which works fine. As for the extra-long mounting strap getting in the way, you can simply shorten it with a scissors. I'm very pleased with my Vis 180.
I wanted to be sure I would be noticed during daytime riding. It is very bright. I have also strapped it on my arm when walking at night.
There are four modes 70 lumens (red)25 lumens (yellow) blinking, 35 lumens (red) blinking13 lumens (yellow), 75 lumens (red) constant, and 5 lumens (yellow) blinking. Whereas some reviewers have complained about the strap being too long, it is easy to deal with the extra length by double looping it. My only complaint is that this light is a little heavy, but it is very bright and it attaches easily to my seat stay. I am only 5'4 so I do not have room on my seat post to mount a light. I must mount a light on my seat stay. Note I mount the light upside down so that the angle is directed horizontally. I like this light. Much brighter than what I had before Serfas Thunderbolt Tail Light (UTL-6). This Light & Motion taillight weighs 100g on my Park gram scale.
