Those latest unusually bright/efficient flashlights, be used to make generator

[sm0ky2]

None of the electronic devices on my YouTube are "self powered"


The closest would be the Earth Battery, but those deplete over time
and have to regenerate.



there are ways to 'tune' the frequency of a JT to achieve extremely long
run-times with a mostly-dead battery, but even those have to replace the
battery 2-3 times per year.


I have seen claims of the JT used to charge batteries, but I have yet to test this
method. (I remain skeptical of such claims)


They can be highly efficient, which is a step in the right direction.
There are "how-to" instructions available if you do a google search
I would suggest replacing the resistor with a variable one, for tuning.


You can recycle used batteries with the device, to drain the last bit of energy
Or greatly extend the life of new batteries.

[sm0ky2]

As far as the "overunity" claims of these new ultrabrights


This is based on an old assumption of the power conversion
of Watts to Lumens.
Which has been broken by the leds


The "actual power" emitted as light is still less than what is consumed
We are just able to make more Lumens per Watt than previously assumed


JTs operate by pulsed DC current, so the LED flashes rapidly
Often it can turn back on before one of two things happen
1) the response time of the human eyes (>~60hz)
or
2) the cut-off time of the diode (time it takes for the led to turn off)
Both of these things make it appear to emit steady light.


But they are not providing constant power, it is pulsed.

[e2matrix]

Older and cheap LED flashlights used pulsed modulation but those tend to create a strobe effect when moving them or moving something in front of the light rapidly so they are not used much now unless the pulse frequency is very high.  Over the last 12 years LED's have become more efficient every year but are not overunity.   You can actually put an LED in sunlight though and get some power out of the LED but not a very useful amount. 


LED's are obviously way more efficient than tungsten filament bulbs and even more efficient than fluorescent bulbs.   Anyone who has not converted their house lighting to LED should really do so.  It can pay for itself fairly quickly.   60 watt equivalent bulbs in LED can be had for $1 or less at many places now including Walmart.   


postingsite,  also since you are mentioning powering something with a flashlight I assume you mean to shine a light at a solar cell to create power for a laptop etc.?   If so then the big problem with that idea is that solar cells are most often less than 20 percent efficient so no matter how efficient the LED light is you will lose a lot on the solar to electric conversion.

[postingsite]

postingsite,  also since you are mentioning powering something with a flashlight I assume you mean to shine a light at a solar cell to create power for a laptop etc.?   If so then the big problem with that idea is that solar cells are most often less than 20 percent efficient so no matter how efficient the LED light is you will lose a lot on the solar to electric conversion.

  no, I'm not interested in any solar-cell effect, in regard to these flashlights

  I thought that since these latest flashlights contain JT like circuits,  so they are high-performance  JT like circuits pre-built(  since I cannot build anything ),    that it may be possible to,  for example :
    - remove the LED's(  throw the LED's away ),  connect the wires from the flashlight that went to the  LED's,  to a Coil( A ) wrapped around an iron-core( cylinder or donut shaped iron-core),    then wrap another Coil( B ) on the other end of the iron-core, or even onto an opposing  iron-core,   and  use the  output current generated from Coil( B ),   to power the  JT like circuit in the flashlight,   by removing the batteries,  and attaching it to the terminals.

NOTE - Wikipedia still describes an electromagnet as having the following effect :       
    https://en.wikipedia.org/wiki/Electromagnet
       "A core can increase the magnetic field to thousands of times the strength of the field of the coil alone"

I only have ideas for the very basic principles,  to make a self-powered-generator,  not how to properly and safely power a phone-recharger,  and a very-small-laptop

Here is some more detail of what and why I wanted to make it -
______
(  I suspected that JT circuits,  was one of the  solid-state  designs that have achieved self-powering,  so I thought that maybe one of these models of flashlights :
       -  can be modified to be self-powered
        -  then connect a number of them together,  to power a very small laptop, and phone recharger,   (  I doubt powering a microwave could be achieved )
         - In my case,  it would allow me to rent/live-in a building where they are not allowed to connect the electricity( since they cannot pass the wiring inspection,  due to old wiring ),  so rent a different type of accommodation for my own reasons    )

However, I have almost no experience building circuits or anything like that( only 2 radio-shack circuit-kits on breadboard, no soldering,  long ago ),   so I'm looking for an option,
    -   to buy things that are already constructed, 
    -  so I could maybe achieve tiny modifications to make them   self-powered,   
    -  connect a few together,  and power some low power home devices     )
______

[sm0ky2]

I don't know of any JT's that are "self powered"
You can rest assured that these flashlights require batteries to operate.