Awright, I'm getting a little excited over not much shown by that crappy pic. The best ones I didn't even get to image due to the aforementioned BATTERY PROBLEMS! Grrrrrrr....
I ended up setting my primary taps at 1/2 turn (inner) and 8 turns (outer) and got 1.5' max sparks using a breakout point. It was sweet! I wish I could've gotten the effect it was having on the lawn chair better...as the corona was dancing around it, there was a kind of "glitter" effect on the chair back. You can see the outer tap at the bottom right of the pic.