UFO Files

On June 26 a local New Jersey man spotted a strange blue light hovering over his house. It remained for about 20 minutes before it moved on. The craft/object changed colors several times. He watched it vanish into the tree line and it did not reappear.

He did get images, which is cool. MUFON or Open Minds.

Many of these encounters talk about objects changing colors or have flashing lights. Our own aircraft do this, but its purely for communications or to let someone else know you are in the area. 

Assuming that some of these sightings are alien intruders, who are they communicating with? Each other? Hybrids on the ground? What purpose would changing lights serve...