Me thinks Sailmonkey's origianal post was talking about flashlight nav lights consisting of, a flashlight with a two color lens and a cheap
c-clamp made to attach a very non approved red/green to the front of a small aluminum
open runabout. I recieved one of these as a gift from a well meaning friend once, never used it.
A flashing strobe light is legal
to use as a distress
signal only on pleasure craft, or used to be anyway, as far as I know, but don't quote me on that, I think...