Enlightenment is not an experience at all, because the experiencer is lost. The "I", the ego is lost.
Enlightenment is more like an experiencing. It is a process. It begins, but it never ends. You enter it, but you can never possess it. It is a deep merging and melting with Existence. It is a oneness. It is like a drop dropping into the Ocean.
Our Universe is a multidimensional one; every individual life unit consciously functions in a particular vibratory level (dimension or density) but unconsciously/ subconsciously functions in and through all the other levels, and as the awareness increases it moves to the conscious existence of the next immediate level.