I was sitting on my front steps around 9-9:30 pm in late April or early May. Across the street looking west, I saw lights approaching and thought to myself, "He's flying awful low." I turned my head for some reason, maybe my dog, I do not recall, but when I looked back up it was practically overhead and I saw a swirling multi-colored smoke, yellow, a reddish-orange, and maybe a bluish or greenish smoke, not mixing, but swirling in their own area within that circle. I was slowly making a 90 degree turn right over my house. It banked slightly and that's when I noticed the central light. I heard a soft, low hum, like an electric motor. I remember getting up and walking to the end of the porch and watching it as it slowly drifted south. There were two white lights on the rear of the craft which were more centered and were not the same lights beneath in the three corners of the craft. I would most like to know about the center light. I could find no pictures of any triangular craft with a multi-colored central light. I'm sure it was stealth craft. Are there any military craft with such a central light or any UFO reports of the same?