Planet Bike's is a Superflash with a Cable Its like their 1W battery one , but you run the plug to a Hub dynamo..

Power supply Plug in the cord, so It comes Off to Go In your Pocket, Which of course turns it off.

Wearing Bright clothing, in the day, to me is probably fine , Thats what I do .. Buy a Neon Lime or Orange parka or Jacket.
For Night its got reflective stripes.

I use a Hub-dynamo wired LED Light Set... European stuff does not Blink, due to a chosen regulation .

they have a sensor in them for Light .. My Eyc T has 3 LEDs 2 for day running the 3rd one comes on at night.