The cheapie, but very bright, headlight I have on my drunkbike that I ride around town at night goes to full-bright blinky mode when I turn it off and it bothers the hell out of me for the eighth of a second it takes me to click the button twice. If I rode with that thing flashing at night I'd just run into a bus to make it all stop. I've seen bright lights that change slowly from around 100% to 80% and back and I like that, but flashing is just awful.