faraday flashlight?

How possible? my first guess would be that is has a battery rather than a supercap, and it arrived partially charged. If it is a capacitor, then it too, would have to have been partially charged. There is not enough energy in two minutes of shaking to run even the most efficient LED. Run in all the way down try it again, and let us know.

Capacitor does hold the charge, but would never be that long. I'd suspect the so called supercap that you have is actually a rechargeable battery. While you are cranking up your magnetic coil, it simultaneously rectifies the generated voltage and charges the battery.

Depends what you mean by bright. A modern LED can appear "bright" at 1mA or less. Not flashlight bright, but still bright enough to work as an indicator light.

So let's see... 1mA*2V*12h=2mW*3600s/h*12h=7.2J/h*12h=86.4J. You can probably put in 1W by shaking hard, so that's 120J in 2 minutes.

Yes, pretty impressive, but not outright impossible.

My gut feeling would have been that these things work for ten minutes. So I am surprised, too. Looks like a very reasonable technology, after all. Thanks for asking... I like to be surprised!

High Performance Tactical Flashlight : http://flashlight.uzaev.com/?EUla

Is the light source an LED? That could be half the question right there. LEDs use less energy than even Compact Fluorescents.

EDIT- What brand is it? I need to get one! LOL!