Guys I did an experiment with flint today : so I was investigating tygeta system , in one of the planets I saw a poi and it was a mining farm , it also emitted light that's how I saw it in the dark side of the planet . So I started raising the altitude to find out how long I can see the light on the planet surface form the mine farm , the result was about 9 and 10 km , so this means that most lights coming from anything can be seen up to about 10 km , so this means that the barnacles green light can be detected up to about 7 to 10 km . So as I said focus your attention on green lights emitted from the dark side of the planet instead of pois ( not saying don't look for pois I'm saying focus on those that could emit green lights ) that's how we might find the barnacles ,
hope my conclusion of this experiment helps