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I wonder if this is a Swedish thing. I recently moved to a newly built apartment in Stockholm (as a non-Swede). All spots to put a ceiling light come with a hook and DCL socket, so it makes it super easy to swap lamps.
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Never seen a light fixture that screws into the ceiling.
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Some fixtures screw into an electrical box attached to the studs in the ceiling. The IKEA SIMRISHAMN pendant does that, for example.
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Looking at the Ikea US website, the Simrishamn and PS 2014 seem to have similar solutions: a plate that screws into an electrical box and provides a hook (the lowest common international denominator).

What do you do if you want to move a ceiling light a bit to the side? Do you install an entire new electrical box?

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If those electrical boxes are anything like the ones in the video I shared, then they’re trivial to move.

You don’t actually need the box though. In fact they weren’t even available in my previous two homes. It’s really more a convenience thing than anything.

But again, this is assuming we are talking about the same thing (region differences and all).

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In the US, NEC and most local codes (which are often based on some version of the NEC) require that connections be made inside a box. This is largely because connections are the most likely place for an electrical fire to start and the box helps contain it.
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I can’t speak for where you are, but it’s the norm in the uk. Eg around 4:25 in this video https://youtu.be/WZizlnLfLks?si=LjRI1EWIHhn6Ktgx

When I bought the Ikea light, it was just hook and no way to fix the plastic surround to the ceiling.

Ikea might have updated the light since then though. As I said before, I got the light when it was new, long before it went viral, and ikea might have tweaked the design since.

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You haven’t been to Germany, I guess. Or the Netherlands.
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