The concept is not really that black/white extreme type, but rather has many shades of grey. Lucidity levels just indicate the amount of awareness, and therefore control, you have over your dream. The higher the level the more the control, obviously. There are some people here that can materialize objects or have thunder bolts drop from the sky at their command. That doesn't mean that they are high level lucidity, and all can do so as well if they have high level lucidity too. It really does vary for each person, and it also varies on the occasion.

In simple terms the higher the lucidity level the higher the control