This is the 5318th most frequent Russian word.
освещением
"Освещением" means "lighting" or "illumination."
In this sentence, "освещением" is used as a noun in instrumental case, referring to the method deployed for lighting a structure.
Мы были впечатлены искусственным освещением здания.
We were impressed by the artificial illumination of the building.
Here, "освещением" signifies lighting conditions or the arrangement, again as a noun in instrumental case, indicating what the problem pertained to.
Проблема с освещением в комнате была решена установкой новых ламп.
The issue with lighting in the room was resolved by installing new lamps.
In this phrase, "освещением" expresses the quality or type of lighting that complements the décor, serving as an instrumental case noun describing the manner of enhancement.