Triangular craft with multicolored lights

I heard a humming sound much quieter than a typical small aircraft but loud enough to get my attention.  I turned in the direction of the humming and saw a vehicle rising above trees at a small park.  
The vehicle had 3 large white lights in the front with many colored lights along the wing edges.  The overall shape appeared to be triangular, delta or perhaps a chevron.  The center white light was pointed straight down as the craft was rising but swiveled up to point straight ahead matching the other two white lights when it was just above the trees.  
Once above the trees the craft started to move forward on a path that took it in my general direction.  At this point the three white lights went out and only the multi-colored lights on the wing edges remained on.  The craft accelerated while gaining altitude and moved out of my field of view.
Witness indicates that date is approximate.  PD