I have a night light bulb, foil, and a geiger counter. Can I produce XRays using a high voltage pulse generator (like those ebay stun gun modules) or do I need a constant DC voltage? Reviews mention ~1in arc and maybe 20-40kv.

https://www.youtube.com/watch?v=af8wnm2eGWw
https://www.youtube.com/watch?v=r0ONN9BtwhY