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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)

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To me it looks like the white plastic end plates are removable, the cover may be screwed in place below those access plates.

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    Thank you for confirming my hunch; indeed I could remove them by wedging a precision screwdriver in the small cavity and applying a moderate amount of force sideways (away from the lamp). This is how it looks like: i.stack.imgur.com/VdLU5.jpg i.stack.imgur.com/lC5UT.jpg – Glorfindel Dec 15 '19 at 13:23
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    In fact the pictures seem to show that the covers have been prised off before. In general a slot that would take a typical electrical screwdriver (approx 3mm) is a good sign – Chris H Dec 15 '19 at 19:03
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    The inner screw looks like it holds the cover on; the outer holds the entire assembly to to the ceiling/wall. – CSM Dec 15 '19 at 21:56
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    @CSM correct. I don't have a lot of DIY experience but once I see screws I'm confident I can disassemble and reassemble something without permanently breaking it. The bulb has been replaced meanwhile :) – Glorfindel Dec 16 '19 at 8:57
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    I like that attitude, @Glorfindel!! – FreeMan Dec 16 '19 at 15:53

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