Long sparks from ignition coils plus a large mercury floodlight give interesting effects.
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I used a very large light globe (10 inch diameter) and applied high voltage from my ignition coil setup between the filament and a small wire loop in the front. This results in the front of the tube lighting up with long sparks like a plasma globe. The effect is quite dramatic and colourful.

There is a spray of sparks to the wire. This is natural colour with no processing. The centre photo shows sparks jumping over 6 inches around the outside of the globe.

Photo Date: 2008