Hi Warren, my experiments with HV lighting produced ozone too.
I could see the wires glowing purple with the lights off.
Just in case readers are not aware. Always experiment in a well ventilated area.
Too much ozone in a confined space will attack your lungs and can cause damage.
Lightning produces ozone too and this is the reason for the odor in lightning storms.
Here is Nikola Tesla's patent for producing ozone.
Maybe there is a gem hidden inside.