I'm from Spain and all city streets and plazas have at least some lighting at night (enough that one can comfortably walk through the city at any hour of the ni

I'm from Spain and all city streets and plazas have at least some lighting at night (enough that one can comfortably walk through the city at any hour of the night) and even the least lit areas are popular for people to hang out in. I do not think it would be feasible, desirable or safe to reduce lighting to the point where it would be uncomfortable to be hanging out at night. I might even predict the opposite effect: drinking on the street, although popular, is illegal in Spanish cities. Darker plazas would make it easier to hide drinking from the police, and could attract even more people.