There’s a modified lights.txt file in the XP11 forum at x-plane.org, and I must say it produces some stunning results with no performance hit so far as I can tell. Thanks to Dave for pointing me to the file, and here’s the link (the file is about half-way down on the first page).
I shot this quick and dirty with my iPhone last night, so there’s no audio and about 20 seconds of the 4:21 are out of focus. But you’ll get the gist. It really transforms the already spectacular X-Plane night environment, so much so that when I first looked I said, “Wow.”