Row of bright equidistant stationary horizontal lights rapidly flashing back and forth, then went dark. NOT Starlink

In October 2021 about 8:30 pm on a moonless very dark night my husband Richard and I looked north out of my studio window and saw a perfectly horizontal row of 12-15 very bright, evenly-spaced, equal-sized stationary bright round white lights either just above or atop a nearby mountain north of Sedona (could not even see the mountain, only the outline of trees and houses on our street). Whatever they were affixed to or emanating from, it had to be at least 12-15 feet high and 150 feet long, as compared to the familiar mountaintop, and ,oddly, it was perfectly perpendicular to our line of sight. (If they were on a round ship or at any other angle than perpendicular to us, they would have been smaller on the ends etc. per normal vanishing perspectives. ) This was not like any Starlink photos I have seen which do not show perfect equidistant bright lights all the same, and horizontal.
They flickered back and forth very rapidly for about ten minutes. They they went dark and we saw nothing except a dark night. We never saw them in any way fly or depart.
This was pretty strange, but now it gets even stranger. Telling this story soon afterwards to two different neighbors, both saw similar things in Sedona, one about 2 years ago and the other about 5 years ago, more to the east. THEN, when I recently told this story again to 2-3 different friends, TWO had had their own similar sightings. One was years ago in the California desert and the other was seen about 1980 with by his whole family driving at night in the Indiana countryside.
How strange it seems that we have not heard more about this and yet it seems maybe common. We can’t hardly find any similar reports online except about Starlink and it was clearly NOT that.
Except perhaps for the Indiana family (don’t know) all who saw them are all spiritually-oriented and curious about UFOS-- but not people who have seen a lot of them or any, to my knowledge. My husband and I have joked about maybe it was a portal to another universe or timeline ---and honestly, that could be as good an explanation as any.