Albert Barnes 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. Greek, Lights, in the plural. Probably several torches were brought by his attendants.

And came trembling. Alarmed at the earthquake, and amazed that the prisoners were still there, and probably not a little confounded at the calmness of Paul and Silas, and overwhelmed at the proof of the presence of God. Compare to Jeremiah 5:22, Fear ye not me, saith the Lord? will ye not tremble at my presence? etc.

And fell down, etc. This was an act of profound reverence. See Barnes "Matthew 2:11".

It is evident that he regarded them as the favourites of God, and was constrained to recognize them in their character as religious teachers.