ah. you could make a book only about lamps in Evora. Actually about almost every cit in Portugal. Evora has wonderful lamps, comming from the renaissance period (adapted to eletric of course) and many from 18, 19 and debut of 20th century. In winter time when fog is covering all the city, you can stare amazed to the old buildings lighten by this gothic and medieval ambiance. Wonderful atmosphere, great to make some nice pictures indeed. If you actually want a good pic tip, just go to the back part of the cathedral at wintertime during night (more or less midnight) and just across the arch from the mueum you'll look up and see one of the cathedral's window iluminated by inside along with the fog...oh yeah, thats a nice spectacle.:
Just follow the street that goes from the Largo Conde de Vila Flor where the roman temple is, to the back part of the cathedral heading the Largo de Sao Miguel.