On the beach in Cornwall I've seen "sea frits" (is that the term?) in which the mist is phospherescent and millions of sparkly bits show, despite it being completely dark.
> Flash in the dark + excess mositure = floaty balls.
That's what I meant! That pic you linked to Hob - that's pretty much what my St Nectans Kieve pic looked like! Except more orbs, less subject matter...