I was on my back deck ,which over looks Clearlake (Soda Bay), when I saw two spheres of circling each other for approximately one

There were two fizzy spheres of light (as if looking at a light through a screen of fog). I could not see anything defined and they looked as if they were 100-200 yards off my back deck (which is about 100 yards above the lake) and a couple of hundred yards above the lake (Soda Bay). They would continue to circle each other (approximately 40 yards apart) in a diametrical fashion (opposite each other). After approximately 15 minutes, one of the sphere's would start to advance closer to the other one (while still circling) until it met up with it. At that point, it appeared to join the other light and continue to make the same circle as one light. After approximately 10-15 minutes, one of the lights started to move away from the other one until it was opposite again. They would circle each other in this fashion for approximately 15 minutes and repeat this same process again. The whole incident lasted for over an hour. It should be noted that there was absolutely no sound during this observation and no indication they were search lights (no trail lights to the ground).
We observe that the report is not inconsistent with a sighting of advertising lights, circling one another.  Just a guess.  PD