For your attention - light bulb with nice mixture of inert gases inside allowing to use it as a plasma ball. Video and photo shows that it have a lot of arcs if connect this lamp to Tesla coil. 

I have used microphone body (Simple Dynamic Vocal Microphone Oktava MD-380A Cardioid XLR) to make this video and planning to make it powered by 18650 batteries and be like a portable plasma torch! Just waiting for parts and will share it here what I have made!

Build your own plasma ball with this light bulb! Also can make it glow like plasma and as usual incandescent bulb both, so its a whole territory for engineers fantasy!

In 1 lot - 2 bulbs.