I realize very much thought has been put on trying to establish a level of lucidity.
Through my five years of experimenting with subconscious mind altering and lucid dreaming, I do not feel that this can be categorized down to levels. Because of the so many unique variables, complexities of our minds and individual experiences, makes lucid dreaming all but impossible to pin down. An area not to be labeled.
I have gone back and forth on this myself several times. Only to experience something new, or a new level per say.

If one is so intent on putting levels on their lucid dreams, might I say this;
Levels are made to be broken!