(Chohan is a Sanscrit word for 'Lord'. To be a chohan of one of the rays means, the energy of that ray in Christ and God, flows through that Master to all on earth who are evolving on that particular Path).
The Fifth Ray is the Green Ray of HEALING, WHOLENESS, PRECIPITATION and TRUTH. The Green ray is a perfect blend of the blue and the yellow rays - the Faith and the Wisdom of God in Nature. Green is the color of Abundance and Supply, and it corresponds with the Third Eye Chakra.
Hilarion is the Hierarch of the Temple of Truth on the etheric plane over Crete, Greece.
Hilarion was embodied as Saul of Tarsus, who became Paul the Apostle after his conversion by Jesus the Christ on the road to Damascus. As Paul he followed Jesus teaching and healing for the rest of his life, after which his soul re-embodied one more time as Hilarion, who was a great mystic and miracle worker and who made his ascension following in Jesus' footsteps.
*Ascended Master: One who has walked the earth with mankind and who, through Christhood, has mastered time and space and gained mastery over self and oneness with the Divine.
For further reading, please see the book 'Lords of the Seven Rays' published by Summit University Press.