I agree with nyc above. Super rapid strobes are bad and if there's a valid use case for them, I don't know what it is. I have one headlight that has ONLY the seizure mode, so it doesn't get used much, and only in steady mode.

Maybe a 2hz flash is about ideal to me. For attention getting, it could be about 20% duty cycle or even shorter. that is, on 20%, off 80%. Saves battery, just as attention getting as a 50% flash.

"Strobe" means extremely short duty cycle, like a 1/100th of a second on or less. Even if it's only coming on once every 10 seconds, that's still a strobe. Most of the super fast flash modes I see are not strobes, they're just rapid flashing.

I really like the Cygolite strobe. It doesn't flash many times per second (2 or 3) but the flashes are extremely short duration, so they're not blinding, just attention getting. The strobe over steady is particularly nice - it's a steady 500 lumens or so (on my Metro 550) with just very short 50 lumen pulses over the top of that, so you can see by it but it's also attention getting. That's a strobe too, by my definition.