This is a term for an occult energy field that comprises the astral material. Astral light, according to many occultists, is the substance that forms images from thoughts or thought-forms. Anything entering astral light stimulates it to form around the catalyst. In performing this process it creates a replica of the object, or a conceptual image of the thought or idea. Afterwards such images can be transmitted into the physical dimension where they are manifested as material objects or situations. Astral light possesses sentience that is derived from the primal imprint of the divine consciousness within the astral dimension. A.G.H.
Source: 78, 24.