Thanks for all the comments. I'm starting to be convinced, and now I think one main reason it can be more effective than hi-viz is that to see a hi-viz cyclist, the driver has to be looking in that direction; OTOH, you don't have to be looking toward a light source in order to see its light, esp. flashing light. The light "comes at you" actively, while hi-viz is passively waiting to be seen. With that said, lights do have great directional restraint which hi-viz is less subject to. Also, in many case you can see a neon lime figure far away when lights are still too far to be seen.
Really?
Have you tested it? I think 150 hours is a big exaggeration, given that it runs on two 2032 button batteries. (OTOH you can get 100+ this light for the price of a dinotte
)
No; I just got it a few weeks ago.
Still, if it doesn't last very long they make the same thing in a USB rechargeable that is also really cheap so I might give that a shot...
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Today, I believe my jurisdiction ends here...