Bright white Flashing lights on the craft

I noticed it in the sky far enough to be over the ocean with really bright flashing lights on the object. Then the lights went out and it started to slowly sink as if it was sinking down closer and closer to the Gulf. I lost it after it went behind trees that are in my backyard but it was far enough away that I knew it was over the ocean which is about 4 miles from my house. I just thought it was very odd that this thing in the sky had this big bright lights on them like they had headlights or something. It was not a plane because it ever so slowly just kept sinking and sinking downward.