The three bright orange (not red like a plane - bright orange) lights in a triangle on the front of each caught my eye first. Three crafts flying East to West over Mesquite (near 635/30) in a straight line, staying the same distance apart and at a very fast speed. Absolutely NO sound. Then the lights went dim on the first, followed by the second, then the third one's lights went out and they became these giant grey floating bubbles just like a kid's bubble toy would make with the sides flowing and moving. One single orange light remained on each and circled the interior in a straight path around the bubble. They were moving much faster than a helicopter but at about the normal altitude you'd see a traffic helicopter. No sound. Just three huge floating grey bubbles.