Revit has some great tools to help us view a model from many different positions. We can have plans, ceiling plans, elevations, sections, 3d views or 3d sections. This enables us to view what we want when we want to see it.
I get lots of questions concerning the View Range in the View Properties. The View Range will allow you to change your Cut Plane and set your upper and lower limits. This is very helpful, but you need to understand one key rule: Revit will not actually show an item unless the view is cutting through that item.
A floor plan is typically a plan that is looking down and is cut by default 4'-6" above the level line. This means that a light fixture that is 8'-0" above the level line is not being cut by the cut line, which means that the light fixture will not be seen in the floor plan. One of the most common questions I get is "how do I get Revit to show the something on the ceiling on a floor plan?"