The light bulb will be lit whilst it is floating but is incredibly light as no batteries are required.
The light bulb is large and colorful and the way you are taught to treat ordinary monofilament fishing rod wire makes it truly invisible even at very close distances.
You'll need to provide your own moves and routine to use the floating light bulb apparatus that you are taught to build. Royle does recommend sources in the video and PDF for moves and routines.
These sources will enable you to pass a solid hoop all around the bulb as it floats and also over the bulb as it floats.
Plus you'll be able to make the bulb float down through the hoop to the floor and then back up again, across the stage and all manners of other impressive moves. All of which are fully self-contained using this one man method which could be performed surrounded in Cabaret.