Most current cameras are rated at 250 volts according to their manuals*. And despite extra control circuitry, the 'stone age' method of discharging a small capacitor into a trigger transformer to create an ionising pulse is still the way they work today, albeit with a couple of thyristors to turn it off when enough light has been received.

(* the Nikon D100 I foolishly bought in 2003 was rated at 250v).