I have seen these lights (to me, the same) twice over 20 years apart. In two different countries more than 20 years apart (maybe more but I don't want you guys to think I'm too old)
I have attached a video and a sound clip regarding these lights this time seen in texas. The video is not mine and I got this surfing the net and I immediately recognized them.
edit: i dont see the video and mp3 are not allowed at this point. so maybe it will show up at a later time 8-/