Three large, bright blue lights moving in unison during the early morning.

My sighting took place about 5.5km SE from Cork City centre at roughly 4.45am. I was jogging alone in the Blackrock area when a street lamp up ahead began to flicker and buzz loudly. I stopped at the lamp to see if it would go out and as I waited I happened to turn and look northwards down a dirt road leading away from the main road I was running along.
A large break in cloud cover above me revealed three bright, pale blue lights moving together in a southward direction. The spacing between the lights remained equidistant, giving the impression of a singular large object with three points of lights on the bottom. I listened for any aircraft or drone noise but there was none and there were no secondary aircraft signal lights.
They had a strange quality to them, they didn't flicker but looking at the centre of each one was like looking at a light being shone through ice or crystal and there was a difference in colour around the edges, as though they were sunk into a surface.
I began to take my phone out of my pocket to video what I was seeing and as I did so they began to dim, starting with the light nearest me. They dimmed down to just pinpoints of light while still moving and did not go behind any cloud. By the time I could hit record they had disappeared. I walked in the direction they had been traveling for about 15 minutes but turned back and went home after there was no sign of them again. The entire event lasted about 20 seconds. Weird.