This is just an idea.
I was thinking of making a simple white L.E.D. light for the end of my handle bars.
Something that turned on automatically when a hand approached the grip.
There is no way I want to throw good hard cash for a manufactured light and
then have to take it off/out of the handle bars every time I lock up the bike.
I am already going to have to do that for the front and maybe the rear light.
If some idiot wants to steal an inconspicuous L.E.D. there is nothing I can do.