Rushlights are small lights made by dipping the dried pith of a rush plant in fat or grease and then lighting it.
Rushlights were used a long time ago when there was no electricity.
Examples:
They used rushlights to see in the dark.
The rushlights flickered in the old house.
She lit the rushlight to read her book.
The rushlight made the room look spooky.
In the olden days, people used rushlights to light their homes.
The rushlight glowed softly in the room.