The number 7 symbolizes the full set of spiritual centers, and the 7 lamps of fire are those centers alight, the higher energies of the body burning in their complete order before the seat of the highest self. The throne is that seat of pure awareness at the crown, the ruling center of a person from which all inner power issues. The lightnings and thunderings breaking out of it are the sudden flashes of illumination and the deep vibration of higher sound that pour through a consciousness when the centers are fully awake and the seat is occupied.
The fire of the lamps is the living spiritual energy that rises through the body's centers and burns steadily once they are opened. The plain sense is that when the higher self takes its seat within, the whole system of the body's spiritual centers lights up and its energies flash into full life.
Throne: the seat of pure awareness at the crown, the ruling center of a person from which all inner power issues
7 lamps of fire: the number 7 as the full set of spiritual centers, the higher energies of the body alight in their complete order
7 Spirits of God: the sevenfold spiritual force at work through the awakened centers