A.T. Robertson Commentary Revelation 18:1

"After these things I saw another angel coming down out of heaven, having great authority; and the earth was lightened with his glory." — Revelation 18:1 (ASV)

Coming down out of heaven (καταβαινοντα εκ του ουρανου). Present active predicate participle. Not the angel of 17:1,7,15 (John's guide), but one announcing the doom of Babylon (Rome). As in 10:1; 20:1.

Was lightened (εφωτισθη). First aorist passive of φωτιζω, old causative verb (from φως, light), common in N.T. as in Re 18:1; 21:23; 22:5.

With his glory (εκ της δοξης αυτου). "By reason of (εκ as in 8:13; 16:10) his glory." "So recently has he come from the Presence that in passing he flings a broad belt of light across the dark earth" (Swete).