Three extremely large lights hanging above nearby trees.

It was the evening and I and a friend were driving home from a meeting.  We have a big hill to drive up to get to the house.  As we were driving up the hill, we noticed three huge lights hanging above the trees off to the left of us.  The site distance from us was no more than a couple thousand feet.  The lights hung about 500 feet above the trees.  I was curious about what they were, my friend was frightened and just wanted to get to the house.  When we arrived at the house and looked down the hill the lights were gone.  I did not hear any noises.  They just hung there.  They seemed huge, like the size of a football field.  This still amazes me to this day.  I have no doubt that these things are out here.
Witness indicates that the date of the incident is approximate.  PD