Deep red is Divine Love. The deep red light is a light that comes down into the physical for its change. It is associated with the sunlight and the golden light. The deep red is the light of the Power that descended before the 24th November 1933 for the transformation of the physical.
The change of the consciousness is the necessary thing and without it there can be no physical siddhi. But the fullness of the supramental change is not possible, if the body remains as it is, a slave of death, disease, decay pain, unconsciousness and all the other results of the ignorance. If these are to remain the descent of the supramental is hardly necessary, for a change of consciousness which would bring mental-spiritual union with the Divine, the overmind is sufficient, even the Higher Mind is sufficient. The supramental descent is necessary for a dynamic action of the Truth in mind, vital and body. This would imply as a final result the disappearance of the unconsciousness of the body; it would no longer be subject to decay and disease. That would mean that it would not be subject to the ordinary processes by which death comes. If a change of body had to be made, it would have to be by the will of the inhabitant. This (not an obligation to live 3000 years, for that too would be a bondage) would be the essence of physical immortality.
This is her secret and impossible task
To catch the boundless in a net of birth,
To cast the spirit into physical form,
To lend speech and thought to the Ineffable;
She is pushed to reveal the ever Unmanifest.