(Image quality probably is bad if enlarged here...)
Years ago when Artbeats used to give away clips once every so often, I got this 9 sec, one. I've used it a couple of times in "Add" track mode with some saturation and contrast tweaks. Back then I asked ArtBeats if I could contact the artist to find out how he or she did it, but confidentiality issues, so no go.
Then yesterday I ran across a company that had a couple of programs, including "Flame Painter" that could do this type of ethereal style -- but... it's only for still images, artwork, etc. So not in motion as with the Dreamlight clips at ArtBeats. If anyone has any idea what prog or generator can do this in motion, let me know.
Probably out of my fiduciary zip code, but no harm asking.
In the mean time, you can have some fun with the free online generator version of "Flame Painter".
Just put your cursor in the field and move around... :)
-- PS: Their other program, "Amberlight" simulates more complex things such as the ArtBeats Dreamlight. But again, it's just for still art and photoart.