Well, in any case, I've sunk several hundred dollars in the last 12 years into trying out various "wonder lights" from Germany and other EU sources, and my favorite light remains a $30 eBay special over all of them. Either the light was too dim or the runtimes were too low (I won't ride with anything that doesn't put the equivalent of 500 lumens on the road and run for at least 3 hours with that output).

At this point I'm really not inclined to waste any more money trying to replace a light that I love and that doesn't bother other road users.