Witness Account

I looked into the night sky and I saw a triangle shaped UFO. There was 3 lights on it in each point of the triangle. They aren't colored, just like a gray light is what it looked like. The lights lit up the interior surface and while it was barely visible it almost had a mirror effect. it was moving southwest and a very fast speed and completely silent. And then it just disappeared. I was like wait come back lol and then I saw it moving from west to east, same thing very fast moving and silent. But this time only 3 lights were visible . And it almost looked like it had stopped for a second before it just shot out of eye sight. Almost as if it had gone behind a cloud and it's a completely clear night tonight. The first time I lost sight of it, same thing, it just kind of disappeared and then resurfaced again going the other direction. I've seen a lot of weird stuff in the sky at night, but never anything like this !!! What was it ?!