Sometimes a group of light balls even flying within 15 meters just demonstrate their true color¬: gold, red, green, blue and black side by side.
Here are two photos of them:
Reference article: http://ufo-spacelife.blogspot.com/2007/09/shape-of-ufo.html http://ufo-spacelife.blogspot.com/2011/06/sphere-ufo.html
click the image to enlarge