A camera flash unit can give a painful nip - but IWHT: anyone who managed to do themselves any real harm with one of those, is an expert candidate for the Darwin awards.What???? Tindel's statement was spot on. Part of the purpose of this forum is to tell inexperienced members when they are venturing into a danger zone and it is not advisable to continue.
Full on professional photographic equipment is a whole 'nother matter though - some of the real big ones have a capacitor bank akin to a capacitor discharge stud welder. But that's leading to the sort of kit used on photo recon aircraft for night time photographing enemy positions.