Two round orbs of light shifting in area

Tonight I saw three orb of light turn into one.  This light that is now known to me, would decrease and increase in brightness.  After five minutes the light dimmed, but was still visible, and a second orb appeared next to the original light.  
The pair would decrease, increase brightness and would move further or closer to each other.  The objects would change direction, or formation.  There was no noise to the craft but I did hear helicopter not too far away.  
When I used my binoculars I did see something emitting the light.   I don’t know what it was but I saw something.  At 00:05, the two lights turned into one and dimmed.  Then I heard the sounds of helicopters about 30 seconds later.