[mrweasel]

In every house I've owned, I've replace the ceil fixtures with those you see in pictures 24 and 25. They aren't special or hard to get, but everyone who notices seems surprised that it's a thing. I'm not sure why more people don't do it, especially in rental properties, so you avoid having tenants mess around with screw drivers and exposed wire.

It installed correctly they can carry around 15kg, which is enough to most lamps. When you have a wife who constantly wants lamps moved around they are really handy.

Annoyingly people surprisingly often ask me to help with their lamps, not once have I encounter them having something as sensible as a ceiling socket, that apparently only exist in my house.