Judas then, having received a band of men and officers from the chief priests and Pharisees, came there with lanterns and torches and weapons.
All Commentaries on John 18:3 Go To John 18
Theophilus of Antioch
AD 184
They carry torches and lanterns, to guard against Christ escaping in the dark.
He asks not because He needed to know, for He knew all things that should come upon Him; but because He wished to show, that though present, they could not see or distinguish Him: Jesus says to them, I am He.