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The Shake Flashlight uses no batteries or bulbs. Instead it uses Faraday's Principle of Magnetic Induction and a super bright LED to produce light without batteries. The flashlight is shaken for a few seconds to recharge an internal capacitor and it will then provide upto an amazing 10 minutes of light. Shake it longer for up to 30 minutes of constant light. How does this happen? As the flashlight is shaken, a magnet passes through a metal coil which, when you shake, "induces" voltage in the coil generating electricity.
During prolonged use it can be shaken for 10-15 seconds for every 2 to 3 minutes of super bright light. The light requires no maintenance so it can be left in your home or car for a longtime but will still be ready to produce light. The bright LED will last for thousands of hours and does not burn-out like a typical lightbulb - it should never need replacement. Great for home, car, camper, boat, or emergencies. Imagine exploring without the fear of ever running out of light. No need to worry about light if your car dies during a dark and stormy night. You'll be in great shape even if you have to signal for help in the pouring rain because it's 100% waterproof. The light it emits is twice as bright as an ordinary flashlight and is visible for up to one mile. This is a flashlight that never needs batteries, replacement parts or even bulbs for that matter. Now that's peace of mind.
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Technical Details
- Super bright blue/white LED bulb- Simply shake to recharge flashlight
- Powered by principles of Faraday's Principle of Induction
- Never needs batteries, never needs bulbs, maintenance free
- Save money - never have to buy batteries
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OPERATING: Just like the larger shake lights, you have to shake them back and fourth to charge the capacitor. You can visit their website for the detailed expert instruction on how these lights work. Basically what happens is, as the magnet moves back and fourth inside the coil, the magnetic field produced by the magnet, creates a electric charge through the coil. This electric charge is then past on to the capacitor. Then the power stored in the capacitor is then discharged into the LED inside the lens.
MINI LIGHT: The mini lights are, well, mini, small enough to fit in your pocket, yet still contain the regenerative ability to recharge. Its just all the parts are made smaller, smaller coil, smaller magnet, smaller capacitor. And that becomes the downfall over the mini lights is the smaller capacitor. It does not hold nearly enough power to power this light for an extended period, and nor will it continue to store power after 24-hours have gone by while not in use. I just don't like them because they don't put out nearly enough light for me. Good stocking stuffer though! lol You have to keep holding the button down for it to light up.
STANDARD LIGHT: The standard lights are bigger, I like this because I can hold them in my whole hand, gives me a better grip that way. The parts inside are bigger, including the capacitor. I like these lights much better because the capacitor is actually large enough to hold a charge to make these lights useful! And if I choose not to use the light for a week, or a month, the capacitor is still holding the charge! This makes them much more useful in my opinion. And on top of that, they are bright too, still use a single LED, but actually illuminate enough to be worth something. You still have to continue to hold the button down to light up.
LARGE LIGHT: The large lights are by far the best of the breed of shake lights. The parts are slightly bigger then in the standard lights, but the light itself is much longer in length. These ones are my favorite, because not only are they the brightest of the bunch, still using a single LED, but they last the longest on a charge as well. I like these ones better also because of the slide switch instead of the button. I can flip the switch on, the light will come on, and I don't have to continue to hold the button down. This way I can use it while working, such as, adjustable temperature settings on my hot water tank.
POWER TO SHAKE RATIO: OK, here is the only down fall with these lights. If you want 2-minutes of light power, you must shake the light vigorously for 30-seconds, not too bad right? But if you want 8 to 10 minutes of power, you have to shake for at least 2-minutes. With the mini lights, because they can't hold a charge worth crap, you have to shake them for 2-minutes just to get a minute of power out of them.
DURABILITY: These flashlights are all made out of plastic, and they are made to be very durable. So durable infact, they have been rated to be run over by a car, and still survive! I totally feel they are durable, the plastic is very tough, I have not broken one yet, and nor does any of them have cosmetic damage. I love the transparent look, being able to see the insides is cool.
CONCLUSION: There are crank lights and shake lights for regenerative power. Our first ones were the shake lights. When comparing the shake lights to the crank lights, I am sorry to say, I rather have the crank lights. Because for one, an elderly person with arthritis will be able to crank charge a light a lot easier then shaking one. And a crank light takes less cranking to charge a light vs the shake lights. All in all, I do like the shake lights, but they surely are not the best for regenerative power. I give them all a 3 out of 5.
By John (Boston, MA)
This thing outputs so little light it's terrifying. The light coming out of my cell phone's display is much brighter than the few nanolumens this thing produces with vigorous shaking.
By Green Girl (Houston, TX)
I am helping my son with an electromagnetic induction science fair project and have studied extensively the requirements for these types of flashlights to operate. This flashlight is better than the 'fake' shake flashlight we'd previously ordered for $2.35 at amazon.com, because it actually uses a real NIB magnet and appropriate circuitry. However, the reed switch (which uses a small magnet to connect the capacitor's stored potential to the LED)doesn't work. Thus, the LED won't light. I'm very disappointed with this purchase. There are genuienly amazing shake flashlights that, both in function and design are truly brilliant devices, but they cost a lot more than this flashlight, so it seems that the old saying, "you get what you pay for", is proven true, once again.
By Philip Gardocki
While our flashlight seems to work, I can't help but notice that it has a lithium button battery, which might explain its function. The "Magnet" is actually a piece of lead. So how does it really work? Shaking it definatly increases the brightness, but it seems it is assisting the magnet.
By Gary R. Hanson
This is a very trustworthy flashlight. Buy shaking it back and forth several times, it gets charged enough to use. It is wonderful if you don't want to be dependent on batteries. When you are in a emergency situation, you cant depend on how much energy is left in your batteries, and when you have to have light, this flashlight this one you can depend on when you need to. I have two.
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