Book of Common Prayer (page 110)

It is not ourselves that we proclaim; we proclaim Christ
Jesus as Lord, and ourselves as your servants, for Jesus' sake.
For the same God who said, "Out of darkness let light shine,"
has caused his light to shine within us, to give the light of
revelation--the revelation of the glory of God in the face of
Jesus Christ. 2 Corinthians 4:5-6

If I say, "Surely the darkness will cover me, and the light
around me turn to night," darkness is not dark to you, O
Lord; the night is as bright as the day; darkness and light to
you are both alike. Psalm 139:10-11

The Officiant then says the Prayer for Light, using any one of the
following for some other suitable prayer, first saying

Let us pray.

Almighty God, we give you thanks for surrounding us, as
daylight fades, with the brightness of the vesper light; and we
implore you of your great mercy that, as you enfold us with
the radiance of this light, so you would shine into our hearts
the brightness of your Holy Spirit; through Jesus Christ our
Lord. Amen.

Grant us, Lord, the lamp of charity which never fails, that it
may burn in us and shed its light on those around us, and
that by its brightness we may have a vision of that holy City,
where dwells the true and never-failing Light, Jesus Christ
our Lord. Amen.

O Lord God Almighty, as you have taught us to call the
evening, the morning, and the noonday one day; and have
made the sun to know its going down: Dispel the darkness of
our hearts, that by your brightness we may know you to be
the true God and eternal light, living and reigning for ever
and ever. Amen.