Refers to a flame-based light or lamp, often with a traditional or poetic feel. In modern usage, it appears in compounds and set phrases.
A small light was lit in the corner of the room.
I turn off the light and go to bed.
As evening fell, the light in the window came on.
I turned off the light before going to sleep.
The candle's flame flickered in the wind.
The city lights could be seen in the distance.