Very large triangular aircraft with very little sound flew slowly over our field and reacted to my presence

I was walking outside to get something from my daughter's car and when I unlocked the car, the headlights blinked - and I saw a light out of the corner of my eye to the right. When I looked over, there was some type of aircraft, triangular in shape, that appeared to be hovering, and a spotlight of some sort popped on and shone towards her car. I then turned and ran back into our house and I stood at our glass storm door and watched as it flew very slowly above where our cars were parked, our detached garage and continued north until it was out of sight. I couldn't help but notice that it was very large, flew very close to the ground, and had very little sound. It sounded almost like the whirring of wind, but I never heard an engine. I also noticed that the spotlight, although it was aimed towards the ground at first, when it got closer, it moved up to be parallel with the ground as it moved past my house.
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