A dark, triangular low flying object passed over my house in Yardley Pa. in the summer of 1992

It was a clear and dark summer night in early June of 1992.  I sat at my back door which was open but screened in.  A loud, but not deafening roar came over the back yard, which extends for a couple hundred yards and is pitch black.  Then, a craft emerged into my view and must have been hoovering at a distance of about two-hundred feet above my home.  It was triangularly shaped with red circular lights that compromised the three corners of the object with a much smaller (circular) white light in the center.  This object glided my view for about 10 seconds with a relativity slow velocity.