Thanks for answering Illum, that helps a lot. It's still slightly confusing Tho, as by that description all the old style flashes would seem to have electronic switches since they are a "momentary push button" like on my laptop, but then again my laptop has no click sound so probably/maybe that's what you mean? Hope so, cause that would mean my newly aquired and much loved Fenix LD22 is safe! Have to find my fluke meter, jump wires etc. I guess. Have discovered that even though you subscribe to a thread (actually seems like such choice is automatically checked) you are not notified so glad I suddenly remembered I posted here, as I sat repondering this very subject as I occasionally need a really good headlamp but don't have one. Even after remembering, at first could not remember which exact thread I posted to. Anyone know what's up with that?