ἀστράπτω

Luke 17:24 ἀστράπτουσα is flashing

For just as the lightning flashes and lights up the sky from one end to the other, so will be the Son of Man in His day.

Luke 24:4 ἀστραπτούσῃ. dazzling.

While they were puzzling over this, suddenly two men in radiant apparel stood beside them.