This is pulled directly from the recent channeled book The 49 Rays of God: Their Meanings and Uses, channeled from the Spiritual Hierarchy by B J King.

“The Rays are expressions of the Creator God and are the Creators, Builders, of all that exists. They are responsible for the evolution of consciousness, as it exists in minerals, plants, animals, Humans and soul consciousness. Each particle of matter is destined to evolve through self-consciousness, then soul-consciousness toward God-consciousness. Since Humans have the capacity to be self-conscious, we also contain the ability to ultimately attain Cosmic Conscious
ness or God-consciousness. The forty-nine Rays of God consciousness emanate from the Creator God, The Absolute, The Most High. The energies move through the consciousness of the individual Chohan’s of the Rays and are metered and administrated in volume before coming into Earth’s atmosphere to affect all consciousness of life on Earth. The Rays reflect the qualities, characteristics and purpose of the Creator or Divine Will. Through this method the Will of God, the Divine Plan and the evolution of life on planet Earth is accomplished. This action is coordinated through manifestation, creation, and evolution.  

Each Ray is coordinated by and through the consciousness of a Cosmic Being known as the Chohan or the Lord of the Ray. Each person is born under the direct influence of a Ray, although during their lifetime all the Rays will influence them.  

It is our understanding that the influence of the Rays on Earth is fairly recent by our time measurements. Each of the Rays reaches the Earth and emanates a color. Prior to the time of the great flood, there was no color. Earth would have appeared to Human consciousness as black and white. When God first began to send the Rays to Earth, to speed up Human evolution, they would have been perceived as the first rainbow.

The planet is moving from the Piscean Age into the Aquarian Age.   The Law of the Piscean Age was the Law of Karma, the Law of Cause and Effect, which was accumulative from one lifetime to the next. The Laws of the Aquarian Age, Harmony, Grace, Beauty, and Balance, promote Compassion, Love, Beauty and Acceptance of Diversity. In the Aquarian Age karma will be lived out in the lifetime it is created and not carried forward into the next life.   This is why so much is happening now, moving to different parts of the World, changing partners and professions to finish up karma brought forward from many lives.  
Ray energies represent Aspects of God consciousness and emanate from the Heart of God. The Rays come into our Universe through the reflection of what is called The Great Central Sun at the center of the Milky Way. Our Galactic Sun is held in position and moderated by two Beings known as Helios and Vesta. The energies coming from the Great Central Sun, at the center of the Milky Way, reflect these energies toward and through our Galactic Sun. As the Rays are anchored in and through the Earth, they are reflected into and through the Great Central Sun at the central core of the Earth, and therefore affect every particle of life in and on the Earth. They flow in a pattern we recognize as the sign of infinity or the figure eight, through magnetic polarity between the two Great Central Suns and our Galactic Sun.

Each of our cells has the capacity to reflect these Rays of consciousness, as a prism of crystal refracts the Light of God, or what some would see as the Light of the Sun, into different colors. Human anatomy, being crystalline based, has the ability to reflect and refract Light. This Light can be controlled and transformed into awareness or consciousness through the brain/ mind of a Human.  

Humanity is becoming increasingly more color conscious. Some are even beginning to understand the capacity of color to heal. Once Humans understand the Rays, and their corresponding color values, they will be able to use this method more effectively.  

As more information is given and understood about the use of the Rays there will be an even faster growth in the awareness of Human consciousness. We have witnessed changes in colors used for decorating, the colors of automobiles, and the colors of clothing through the years. As additional Rays of energy have been anchored on the Earth these colors began to be reflected and “created” in dyes and paints. Objects appeared in the market place with these new energies, these new colors. The spectrum increased from the primary colors to pastels of the primary colors, Earth tones, then metallic colors, fluorescent colors, pearlescent colors and now opalescent colors. Each spectrum is made up of seven Rays.  

As the color spectrum has increased so has the energy in relationship to the number and quality of the energies being sent to Earth by the Creator God. Through the years, more groups of Rays were offered to Earth and anchored intentionally by conscious Humans cooperating with the Spiritual Hierarchy. After each anchoring, we have witnessed changes in art, decorating, and fashion, as these colors were made available in mediums to be used by artists to express these values.  

We have witnessed positive changes in Humanity from slavery to freedom, from total spiritual intolerance to more tolerance, from gender inequality to closer equality. We still have a long way to go to experience heaven on Earth and the thousand years of peace previously predicted. The tools to get us there are the Rays and their uses. The last Rays we were give, 48 and 49, have been given for our use to correct what we have miss-created through our thoughts, actions and ignorance. These new Rays brought the total available Rays to Humans and Earth to forty-nine.  

Each Ray has been assigned a guardian. The title of these guardians is Chohan. The Chohan of each Ray is responsible as guardian of the Cosmic Christ Consciousness of their Ray.”

King, bj (2015-05-22). The 49 Rays of God: Their Meanings and Uses
Kindle Edition.