A photo is a great idea! The older I get the more I forget. Hopefully I set it up so people can view it.
It's not very clear but hopefully you can see it's somewhat similar to a can light. Look close and you can see the individual LEDs. The lens is round with serrated edges (which should provide a good surface to grip) and fits flush with the ceiling. The dark objects in the center are the styrofoam I'd like to get out.
Thanks for all the responses so far!
My Columbus 320RS has some styrofoam debris behind the lens/covers for the overhead lights. I'd like to clean them out but I'm concerned about damaging the fixture. So far I've gently tugged straight down and lightly turned the covers side to side but nothing has loosened the covers. Anyone know the trick to removing the covers without causing damage.