None of these things are normally sold at all in the US. All red LED rear lights blink violently by default, and even fancy expensive headlights have idiotic round flashlight beams. One man has a US monopoly on importing the German products: http://www.peterwhitecycles.com/lightingsystems.htm — but you can import for less than the wholesale price he gives to shops by buying direct from Germany: http://www.starbike.com/php/product_list.php?prodcatid=37...
I own both generations of battery-powerd IXON lights, and a generator-powered IQ Cyo senso plus without reflector. They are amazing — these (and the Schmidt Edelux) are the best lights available by orders of magnitude. Everything else is a piece of shit for road use, even at 5x the price and with brief runtimes on proprietary batteries.
They are the best consumer products I own, and I own some fancy fucking shit. I am dead serious. I've ridden 2500+ miles in pitch black darkness in the last year — and these lights have saved my life dozens of times where nothing else would have.
In the UK I don't think flashing lights are allowed on moving vehicles/cycles unless they're emergency vehicles or otherwise hazardous. Lots of cyclists still use them though.
Huh?
People's perceptions may vary here, for example I also have my eyes when they put on the stroboscope in clubs.