Latin text Lux fulgebit hodie super nos: quia natus est nobis Dominus: et vocabitur Admirabilis, Deus, Princeps pacis, Pater futuri saeculi: cujus regni non erit finis. Dominus regnavit, decorem indutus est: indutus est Dominus fortitudinem, et praecinxit se. English translation A light shall shine upon us this day: for the Lord is born to us: and He shall be called Wonderful, God, the Prince of Peace, the Father of the world to come: of whose reign there shall be no end. The Lord hath reigned, He is clothed with beauty: the Lord is clothed with strength and hath girded Himself.
https://primanota.net/robert-hugill/lux-fulgebit-lyrics.htm