Interesting to hear. Most scientists doubt that "Ball Lightning" exists. Lightning is just electricity, and electricity is just a bunch of electrons going somewhere in a hurry - that is you need a circuit.
In this model "Ball" lightning is impossible, as no ciruit exists. Some scientists have attempted to produce glowing plasma in the lab using electrical effects but so far (to my knowledge) have been unsuccessful.
The other theory is a retinal after effect, similar to glancing at the sun (don't do this!)