The non-intellectual light is the light that belongs to the elements.

and there is no need for the use of anything perceptible or belonging to the elements. | Intellectual light the mind illumined with divine knowledge | which is poured out without measure upon the natural world. | In the spiritual world a spiritual light. | That darkness does not resemble this | nor does that light resemble this light. | 3.1.13, pp. 70-1