I am Swedish and at home if you walk down a street, most houses will have lamps in some of the windows, outside lights and usually people don’t draw curtains so you can see the lights from within the houses. I was asking British DH today why Brits tend to light up their houses so enthusiastically in December, but the rest of the year people draw their curtains and no one seems to put lamps in the windows (at least not where we live which is London). I am the only person in my street who has a lamp in every window of my house and leave some on overnight too. I think I am trying to overcompensate for my very dark street.