I just remember always hearing a relay snap just before being blinded.
That will be the sound of the tube discharging not a relay triggering it.
I know you need to stay away from reed relays because on high currents they will wield themselves closed
That will happen with any relay if you exceed the current rating of the contacts.
Omron makes a 5 volt relay that will not act like a transformer
That will happen wit any relay.