This is the 10868th most frequent Swedish word.
lights
The Swedish word "lights" doesn't exist; you may mean "ljus," which translates to "light" in English.
In this sentence, 'ljus' refers to visible illumination sources, likely relating to natural or artificial phenomena.
Jag såg några vackra ljus i skogen.
I saw some beautiful lights in the forest.
Here, 'ljus' denotes physical objects, specifically candles, which produce light.
De tände ljus i fönstret för att välkomna gästerna.
They lit candles in the window to welcome the guests.
In this instance, 'ljusen' refers to the various types of artificial illumination emitted by the city.