On one of my forays to Metabunk I came across a link to the fabulous 'Phantoms of the Sky' by David Clarke and Andy Roberts (1990) and with a foreword by Jenny Randles:
https://files.afu.se/Downloads/Books/Other/Clarke, David and Roberts, Andy - Phantoms of the Sky.pdf
[The book is long out of print and so I hope it is okay to post this link].
Anyway, Chapter 9 is on earth-lights and their being mistaken for UFOs. There is a huge amount of detail and even though these are natural phenomena it still got my Fortean senses tingling, not least as it involves folk being out at night on lonely moorlands and such like and being perplexed by what they witness...
Personally have had a couple of earth-light experiences: a large fireball that fizzed across the sky following a thunderstorm (1983) and strange, extremely bright flashes in the sky like lightning but a 'colder' blue/white light on a clear night after snow had fallen (1984, multiple witnesses).
Research into earth-lights seems to have peaked during the latter decades of the last Century and yet there are so many 21st Century UFO sightings being shared on Reddit and elsewhere that fit within the definition of earth-lights, so is there any enthusiasm on these forums for a bit of an earth-lights revival..?