Not sure if this is what you're looking for, but the Plainsong and Medieval Music Society's Hymn-melodies for the whole year from the Sarum antiphonal and other ancient English sources together with sequences for the principal seasons & festivals (1920) by Walter Howard Frere (1863-1938) cites these two melodies as proper to the hymn for Lauds on the Feast of the Transfiguration, O nata Lux de Lumine.

Thanks, CHGiffen! If you click on the graphics in my post you'll get the unclipped excerpts. Don't know why they got clipped in the thumbnails!

Here is a PDF of O nata lux set in neumes to the Sarum plainsong melody 41 mentioned above.

Most of the "settings" of the O nata lux text seem to confine themselves to the first and fifth stanzas. Maybe this was a tradition started by the beautiful Tallis setting and carried forward past the Renaissance - through imitation or, perhaps, through unfamiliarity with the original text?

Thanks tomjaw. Where does this extra verse fit? I would like to include it in my score. Thanks in advance.

Chuck

Another version can be found here 6 verses:
http://eo.wikisource.org/wiki/O_nata_lux_de_lumine

and, it can be found in Hymni ecclesiae, by John Henry Newman with 7 verses:
http://www.gutenberg.org/files/34733/34733-h/34733-h.htm

The above version is the one that would be used with the melodies found in posts above.

Also here: http://archive.org/details/thesaurushymnol04danigoog
pg 182 in the Djvu copy.

I have not found it in the Analecta Hymnica but it should be there as well.

Also it can be found in the Global chant database (N.B. This is NOT a complete reference, it does not list the above 2 melodies for a start)
http://www.globalchant.org/text-details.php?text=O-nata-lux-de-lumine-Jesu

The Cantus database has 13 references... Search for "O nata lux"
http://bach.music.uwo.ca/cantus/search.asp

and more (list in alphabetical order of first line of hymn):
http://www.univ-nancy2.fr/MOYENAGE/UREEF/MUSICOLOGIE/CMN/indexcmn.htm

This should give you more than enough to work with...

The mode viii Sarum melody quoted above is, as probably most here know, also associated (in rather simpler form) with Verbum supernum prodiens nec patris, the office hymn at Lauds of Corpus Christi (for which N. de Grigny wrote some lovely organ versets - which one could use with the Sarum melody on Transfiguration).

There is a beautiful from verse to verse translation of O nata lux, WHICH CAN BE SUNG, to be found at no. 234 in The English Hymnal. It is paired with the Sarum mode viii melody under discussion here. The translator is given only as L.H.

O Light of light, by love inclined,
Jesu, Redeemer of mankind,
With loving-kindness deign to hear
From suppliant voices praise and prayer.

Thou who to raise our souls from hell
Didst deign in fleshly form to dwell,
Vouchsafe us, when our race is run,
In thy fair Body to be one.

More bright than day thy face did show,
Thy raiment whiter than the snow,
When on the mount to mortals blest
Man's Maker thou wast manifest.

Two prophets, that had faith to see,
With thine elect found company,
Where unto each, divinely shown,
The Godhead veiled in form was known.

The heavens above his glory named,
The Father's voice the Son proclaimed;
To whom, the King of glory now,
All faithful hearts adoring bow.

May all who seek thy praise aright
Through purer lives show forth thy light;
So to the brightness of the skies
By holy deeds our hearts shall rise.

Eternal God, to thee we raise
The King of kings, our hymn of praise,
Who, Three in One and One in Three,
Doth live and reign eternally. Amen.
- L.H.
___________________________________________________

And, while we are discussing the Transfiguration, here is J.H. Newman's translation of Quicumque Christum quaeritis. Sadly, Newman doesn't seem to have retained the original metres in his translations of quite a number of office hymns. This is from an 1888 book of his verse published by Longmans, Green, & Co. -

The Transfiguration - Matins:
(This can be sung to Swabia, etc.)

O ye who seek the Lord,
Lift up your eyes on high,
For there He doth the Sign accord
Of His bright majesty.

We see a dazzling sight
That shall outlive all time,
Older than depth or starry height,
Limitless and sublime.

'Tis He for Israel's fold
And heathen tribes decreed,
The King to Abraham pledged of old
And his unfailing seed,

Prophets foretold His birth,
And witness'd when He came,
The Father speaks to all the earth
To hear, and own His name.

To Jesus. who displays
To babes His beaming face,
Be, with the Father, endless praise,
And with the Spirit of grace. Amen.
- J.H.N.

Much belated, but here is the full 7 verse hymn set in neumes.

GH Giffen, we sang part of your Sarum setting at Mass this morning. The schola recognized the melody as being very similar to one used for O Salutaris around these.
Is that version of Amen--same 5 notes, but different syllabication--usual for Sarum chant?