If you’d like to chant the Phos Hilaron, I recommend the following setting from The Hymnal 1982.

“O Gracious Light, Lord Jesus Christ,” The Hymnal 1982, #25

Phos Hilaron

“Phos Hilaron,” Church of the Apostles in Seattle, WA

It’s not exactly the same, but you the following rendition(s) of the Phos are clearly based on the setting above by Thomas Tallis.