Sort of silly, maybe.
In case of EMP or Solar Flare, you want your torches to work.
Am I paranoid? 
Yes.
^ +1
I think our metal tube LED lights already are Faraday cages…
I have aluminum wrapped old electronics/chargers that I no longer used and a couple of flashlights that I had no use for.
Making them EMP proof gave me an excuse for not throwing them out, plus……you never know for sure.
Though an EMP is not directly harmful to people, it could lead to deaths by shutting down medical, transportation, communication, banking, finance, food and water systems. In the worst possible scenario, a large-scale EMP could have effects like Hurricane Katrina but on a national scale
Im glad to know that at least I can count on my flashlight to still work when the shtf
but I cant imagine what I will do with myself, if I have to be without the Internet and BLF…
will a tinfoil hat, protect my wifi router? 
Preppers know to keep playing cards, board games, puzzles, books and such, and of course a year or two supply of booze doesn’t hurt.
Flashlight protection would be way down my list in terms of priority, if I was a prepper. Like, waaaaaaaaaay down.
In the event of an EMP due to global thermonuclear war, the only thing you’ll regret not having is a pistol and one bullet.
“I was happy in the midst of dangers and inconveniences.” – Daniel Boone
It would be interesting to see some testing.
Also the tail and very much the head are not encased in metal.
But perhaps being stored sideways would do the job well enough?
I think most led flashlights Will not suffer from an EMP.
The internals cables are not long enough to work as an antenna.
However if anyone has the way to test…
The box I store most of my chargers and lights in is metal anyway. Out of academic curiosity rather than anything else, I stripped the paint between the lid and the base then with lid closed “tested” it with a mobile/cell phone, no WiFi or signal was received so I suppose that’s good…?
> It would be interesting to see some testing.
The testing details, from which HDS claims the EMP proof capability, are in this post:
Thats kinda a mess of contradiction.
My reading is the CE certification, that is common to most imported flashlights because it is required in Europe, gave Henry the data to base his claim that the HDS is EMP proof.
That tells me that all LED lights in metal tubes have similar EMP immunity.
But the real issue is not the EMP hitting the light… EMP takes out all electronic communications, plus EMP is part of a Nuclear explosion, which Radiation is a serious threat to humans, regardless of the status of their flashlights
iow, the EMP issue in regards to flashlights, is a non issue, for many reasons.
Its been my experience that you can’t blanket assume anything.
Now if CE certification simulates EMPs then any light that is approved should be EMP resistant. Who knows how many of our lights are legit CE tested/approved, though apparently some are, Convoy apparently has a certificate for at least some of their lights (and assuming its legitimate and not fake).
Also i wonder if the light being on its back, front or side would affect EMP vulnerability.
Plus the no long wires ignores the fact the body is a long (and thick) wire.
Each issue is its own problem.
EMPs from solar flares are possible, as is a nuclear explosion far enough away to not cause acute harm but enough to cause free radioactive iodine (you can get iodine tablets for this).
Plus my interest in how things work, i don’t expect an EMP in my lifetime but understanding more about it is of interest for interests sake.
I agree, my faraday research was educational
otoh, sometimes a question is asked that is based on a false premise, so the question is not valid and does not produce useful results
for example, this thread assumed that flashlights are not faraday cages, and seeks to protect them
but I assume flashlights ARE faraday cages, so my question would seek to learn if any part of that premise is wrong
as you did when you wondered whether a metal tube is equivalent to a long wire. My guess is no, the metal tube is just a faraday cage around the internal wires, which are very short.
my understanding is only the lens of the flashlight is not shielded by the faraday cage that is the metal body tube, head, and tail cap. so if I wanted to shield my flashlight completely, I would consider a tin foil cap on the lens…
just to press the point home about invalid premises in a question, here is a popular example of an invalid question, based on invalid assumed premise, that produces invalid answers
“do you still beat your wife?”
obviously neither yes nor no would be a safe or useful answer. The question is structured in a way that cannot discover the truth.
anyway, I hope you continue to be entertained by learning about faraday cages, and flashlights… imo, studying the CE certification process would be informative.
I get where you are coming from but i’m a numbers person, i would want to know if it protects, what energy level it protects till, if that varies by flashlight and if orientation of flashlight matters.
That said the answers may vary by flashlight but the results of testing say 10 common lights would be very fascinating.
From: Getting Prepared for an
Electromagnetic Pulse Attack
or Severe Solar Storm
by Jerry Emanuelson
http://www.futurescience.com/emp/emp-protection.html
"Although many LED flashlights are likely to survive an EMP simply because of their small size, the sensitivity of LEDs makes the survival of unprotected flashlights less than certain. Also, many LED flashlights contain additional sensitive circuitry. The small flashlights with an all-metal case are the most likely to survive. Because of the importance of having at least one good flashlight when the power grid is down for a long period of time, it would be a good idea to store at least one LED flashlight in a nested faraday shield."