Hello. First of all, that particular room is going to be reworked.
But, now that we're talking about the theme... There isn't much information about what time period the game takes place in. There is no specific time period; it's completely different to what we consider our world.
It’s a blend of medieval and modern elements. You have witches and magic, along with quantum stuff and sci-fi features, all working together.
In the case of lights, a light switch EXISTS and actually turns the light on without any cable. It uses some entanglement technology that the Tinkerers can do with certain crystals.
And, yes! Since Lucy specifically lives in that house, there are plenty of light switches, lanterns, and lights. She's the one in charge of coding the crystals, making the entanglement work, and changing the "batteries" from time to time.
The OUTLET is a mistake. There are no cables, so you won't see more outlets out there, hopefully!