Charles Ellicott Commentary Acts 16:29

"And he called for lights and sprang in, and, trembling for fear, fell down before Paul and Silas," — Acts 16:29 (ASV)

Then he called for a light.—More accurately, ‘for lights.’ As St. Luke does not use, as in Acts 20:8, the word for “lamps,” it is probable that the lights were torches, and that the jailer, with one in his hand, leapt into the darkness of the subterranean dungeon.