Φος Ιλαρον (O Joyous Light)
This translation is similar to one in common usage, but slightly different.
It is my recollection from A Book of Catholic Prayer, which I bought in 1994
(over 30 years ago). I started off reciting it, and somehow the tune simply came to me.
I’ve maintained a habit of singing it at sundown, albeit with less regularity than I’d like.