This Trinitarian song was listed as new music in 2006 in OCP’s Guitar Accompaniment Book.
The text of the first two stanzas is c6 by Ambrose of Milan and translated by John Mason Neale in the 1800s. The third verse is by Charles Coffin (c18) translated by John Chandler (c19) so not so new. The modern text has been fiddled with because getting rid of “thee” mucked up the rhyming scheme.
The tune BROMLEY is probably by Franz Joseph Hayden, although it has been attributed to Jeremiah Clarke. The tune goes off in memorable directions.
1.
O Trinity of blessed light,
O Unity of princely might,
The fiery sun now goes his way;
Shed now within our hearts your ray.
2.
To you our morning song of praise,
To you our evening prayer we raise;
O grant us with your saints on high
To praise you through eternity.
3.
To God the Father, heav’nly Light,
To Christ revealed in earthly night,
To God the Holy Spirit raise
Our equal and unceasing praise.