There's a lamp attached to the ceiling of the entrance to the garages of me and my neighbours, and its bulb needs to be replaced. The problem is: I have no idea how to open it.
There is no way to identify the manufacturer or model; it's simply not listed anywhere on the lamp itself and reverse image search doesn't give meaningful results. So finding a manual online is not an option right now.
There are caps with a small hole (less than 1cm) on both short sides of the lamp (best seen in the first picture); I suspect these should be able to move but I'm unable to make them do so.
(click on the pictures to enlarge them)