Lights above campervan close above the tree line

We were lounging in Camper and it had got a little warm and smokey from ciggy, I said lets open the roof, rolled beneath it and opened the blind and was literally gobsmacked by what I saw. I grabbed my husband and said out loud Oh My God: above me was a formation of lights and what was either a roof or the bottom of something I have no explanation for. Approximately a dozen lights like fluorescent light in sets of three just above the treeline, the sky was so lit up I couldn't see the trees, it was diffused through the skylight then became clear as hubby was opening the skylight then it went dark and the sky and trees were there like they should be. I have no explanation for this, can't even tell you if we were inside something or looking at the bottom of something. It was directly above me whatever it was.

It went to quickly for hubby to see it too. I really cannot explain this at all, bewildered and feeling annoyed at seeing something like this I can't prove was there or even properly give a description because it was gone so fast. It was so close that i could only see the formation of lights - dunno what shape it was, it looked like I was beneath a dome, or in a dome - sorry for not being able to be more specific.