The Tube of Light mantra is a short mantra to bring forth personal protection. In giving the Tube of Light mantra, it is important to visualize the image of your Divine Self, and give the mantra several times. The following is a brief explanation of the image of your Divine Self.
The upper figure is your Divine Self, the I AM Presence, the I AM WHO I AM, the individualization of God's Presence for each son and daughter. The I AM Presence is surrounded by rings that form the causal body, in which man keeps his or her treasures, which are stored in heaven.
The middle figure is the mediator between God and man, called the Holy Christ-Self or Higher Self. The Higher Self is the aspect of our Self that each initiate wants to embody more fully. Jesus Christ is the archetype of this, the universal embodiment of our own Higher Self.
The lower figure represents your soul surrounded by a tube of light and violet fire, which is released from the heart of your I AM Presence when you recite the this decree. This white light gives you 24-hour protection as long as you maintain your harmony.
Below are the Tube of Light mantra that is part of the Heart, Head & Hand decree. A longer version of the Tube of Light decree can be found here.
TUBE OF LIGHT
Beloved I AM Presence bright,
Round me seal your tube of light
From Ascended Master flame
Called forth now in God's name.
Let it keep my temple free
From all discord sent to me.I AM calling forth violet fire
To blaze and transmute all desire,
Keeping on in Freedom's name
Till I AM one with the violet flame.BOX OF LIGHT
Beloved I AM, my divine face,
Seal around me your tube of light
Of ascended masters' fire
Called in God's name at this hour.Keep this temple free and close
Against discord directed at me.
I call forth the violet fire
Let every desire be irradiated and renewed,
Continuing forever in the name of freedom
Until I AM violet fire in Godhead.