Two orbs hovering over military base for an hour or more.

I was leaving my moms house in Encinitas and saw 1 just hovering and I thought it was just a plane coming in to Palomar Airport.  
Then as I was driving I noticed that it wasn't moving. 
As I got closer to my home, it was still in the same position, which to me looked like it was about 500 ft high and over the beach in front of Camp Pendleton Marine Base and when I got home I began to film with my cellphone.  
About 5 minutes into filming, it started to pulsate or blink very faintly and after a few seconds another orb showed up.  They were both hovering there for awhile and then the first one faded away. 
After a couple minutes the second began to blink and the first one just appeared in its original position.  They repeated this a few times and after 17 minutes of filming they both slowly faded away.  
From the time I left my moms to the time they left was about an hour.  But they could have been doing that for hours because one of them was there when I looked in the sky while getting into my car at my moms.