What you mentioned may be true with the more common LED flood lights, but the newer spot style will cut through like a xenon.
That's interesting. I haven't had that experience with any of my LED lights, including at least one narrow beam with a fair amount of throw, but maybe I should look into this more. I took my entire flashlight collection for an outdoor middle-of-the-night test a few weeks ago. I walked through a field and surrounding woods on a moonless night. It was fairly foggy, and I was very disappointed with the glare from my LEDs. I think it would have been really hard to navigate with them in a pinch. (Of course, in the absence of fog, they are real champs.)