VERY low temp LED tests - who wants to see?

[meuge]

I have access to freezers that will let me dial in -20C, -40C or -80C.

I also have a Kaidomain Buckle AAA LED light that I would be willing to risk... as well as a Fauxton.

Who wants to see how long these lights would function at the various temps?

 

[jugg2]

I would like to see the results, though I think that at -80C they might not work at all.

 

[meuge]

I would like to see the results, though I think that at -80C they might not work at all.

I am also considering making a little film of what happens when a Fauxton is submerged into liquid nitrogen at -180C.

 

[DaFABRICATA]

It would definetly be interesting......

 

[nerdgineer]

We did low temperature tests of LEDs some years ago for a project. -40 deg C was no problem for them - it was a problem for batteries and lots of other things, including people - but not LEDs.

 

[jugg2]

That is exactly the problem I think you will encounter, the batteries will not operate at those temperatures. I would love to see a video of a light dipped in liquid nitrogen!:naughty:

 

[MorePower]

Unless the LED itself cracks from thermal stresses due to rapid heating or cooling, the cells used to power the light are going to fail long before anything else.

 

[Gunner12]

I think the main problem would be getting the battery to function.

Everything else should be fine.

 

[abvidledUK]

I think the main problem would be getting the battery to function.

Everything else should be fine.

Long dc power lead to head, replacing batteries ?

 

[tebore]

I'd like to see a Surefire U2 or something at -80C.

Most lights can do -20 no problem. I froze my HDS in a block of ice at -20 for 24 hours while it was on. I have no doubt at -40 it'll still work, but I don't dare chance it at -80C.

 

[Nubo]

Iirc, early attempts at producing blue LEDs used extreme cooling.

My guess is that you'll be able to give them substantially higher power.

 

[fasuto]

Most lights can do -20 no problem. I froze my HDS in a block of ice at -20 for 24 hours while it was on. I have no doubt at -40 it'll still work, but I don't dare chance it at -80C.

Rechargeables or primaries?

 

[tebore]

Rechargeables or primaries?

You mean what did I use? I used rechargeable.

I don't think it would make much difference with Lithiums at -20. -40 I think as long as it's lithium based it'll be ok. -80 is what I want to see.

 

[bondr006]

Who's going to be alive to use anything at those temperatures? So your dead and frozen like a Popsicle, but the light still works...

I have access to freezers that will let me dial in -20C, -40C or -80C.

I also have a Kaidomain Buckle AAA LED light that I would be willing to risk... as well as a Fauxton.

Who wants to see how long these lights would function at the various temps?

 

[tebore]

Who's going to be alive to use anything at those temperatures? So your dead and frozen like a Popsicle, but the light still works...

Isn't that all that matters? You want someone who finds your frozen corpse to click your light and be like "WHOA it still works! Oh hey there's a dead guy attached to it. Ah he won't need it anymore"

 

[hopkins]

Scientists recorded the world's lowest temperature, -128.6 °F (-89.2 °C), at Vostok Station …." Antarctica.
So maybe there is a use for this test.
Go for it. See if the antarctic researchers 'led light' will work as he checks his
experiment outside in the dead of winter at -80C

 

[Burgess]

Gotta' say it . . . .


This is a Very Cool thread !


:nana:

_

 

[Valolammas]

Who's going to be alive to use anything at those temperatures? So your dead and frozen like a Popsicle, but the light still works...

You'll get my light when you pry it from my cold, frozen fingers! :laughing: (I've been at -110C and it's unpleasant. It's used as a treatment for arthritis, which I don't have (yet), but I wanted to know what it feels like. Unfortunately, they didn't let me take any lights into the freezer.)

Anyway, please do test your lights! Even if the batteries fail first, it will be interesting to know how long they last.

 

[MikeLip]

Isn't that all that matters? You want someone who finds your frozen corpse to click your light and be like "WHOA it still works! Oh hey there's a dead guy attached to it. Ah he won't need it anymore"

A macabre, yet practical point of view. I like it!

 

[Ra]

...

I once tested a red 5mm led at -196 degrees Centigrade (led only)
It didn't die: It became at least twice as bright !!
Unfortunately I cannot remember anything about the change in current draw...

Regards,

Ra.