>>1561269
A light socket's design isn't arbitrary
Buy correct bulb and keep your genius ideas about electric fixtures to yourself

>>1561277
the placement does seem to be pretty arbitrary. i've got screw in fixtures in a hallway, pins another, one room even has both pins and screws.

>>1561269
>in the US?
You'll have to do your own research. Some states you can do all the electrical work on your house no qualification or training needed, unless it's a new house you're going to sell. In others you might actually need to be qualified and get a permit for just your light socket like you're asking about. Sometimes it's not just the state, your county or municipality might require a qualification and permits.

>>1561269
>i want to know if i need to
Not unless an inspector is watching you. If you own your own house why the fuck would they know whats happening inside your walls? Do whatever the fuck you want