Thanks for the welcome .

Thanks for the answer. The safe part is what I really like to know most. I work as network admin in a factory. Many computer power supply just can't withstand the fluke generated by giant motor in on off mode. I figure that HV experiment is small scale of that and may harm other electronic too. Based from the answer it is safe.

I notice that in some video blue relay that anyone use produce loud buzzing. The noise would reduce considerably if we pry open the blue plastic casing and put it inside something smooth, maybe cotton.

I read that CFL act also as negative resistor. In the Imhotep circuit the CFL put in parallel with load, I assume this will increase the current flow to the load, right? If we put more CFL in parallel there will be more current goes to the load?

If we put CFL in series with the load would the voltage in the load increase without reducing current?