Lumen — Flashlight Runs on Body Heat, No Battery Needed (Kickstarter)

Here’s a product that people here might be interested in. On Kickstarter, an inventor named Rost Zhuravskiy is trying to fund his invention for a flashlight called the Lumen which needs no battery, but runs on body heat. He claims to have developed a thermoelectric generator which generates enough energy to power the LED in the flashlight when you put your thumb on it.

On the Kickstarter page Zhuravskiy provides some details about the technology:

“In my application difference between temperature of your body (about 98 °F) and environment (at least 82 °F) is enough to generate power for single led. Metal body of Lumen serve as a radiator . . . As you understand, we can’t power really high-output led just with touching small TEG. However, when your temperature is 98 °F and air temperature is 82 °F Lumen produce about 15 [email protected] When difference is bigger – excessive power is stored in a capacitor to power Lumen whenever you need it. Such amount of energy is enough to power 5 mm Cree led with 3000 mCd light output.”

In addition to the flashlight function, there’s another optional feature for the Lumen — you can order a version which has a tritium vial attached, which will glow in the dark for up to 10 years, so when you need to find the flashlight in the dark you will be able to see it.

The cost for the Lumen with an aluminum body is $35, and $45 for an aluminum body. If you pay $15 more for either you get the tritium vial attached.

Remember, this is Kickstarter — so it’s a homemade project without any guarantee, or third-party verification. The flashlight is not being mass-produced yet, and if there is an overwhelming demand, I would expect it could cause production delays. And I do wonder if there might be any consumer safety issues if the flashlights include tritium. So far the project has exceeded its goal of $5000 by far: there are over $50,000 in pledges to date.

Here’s a video:

  • clovis ray

    Of course, i didn’t understand, but i take your point,

  • These are some very good ideas. The stove / cooking plate (which has been mentioned before) could definitely become a hit in no time. Andrea Rossi is pursuing industrial applications, and research organisations such as CERN and ENEA, while pursuing the physics, probably won’t be very forthcoming with the cooking plate, leaving the garage tech people to work on that.

    Such initiatives could very much be a next step for LENR, alongside the industrial applications, as long as there is replicable core technology available.

    Unfortunately, right now, there is not.

    • GreenWin

      Engineering details. Doc, I’m evolving the above to a single product: a hat that converts to a toaster oven/camping stove that warms the bum in a pinch.

  • Omega Z

    Obviously, this guy has never lived in Lake Havasu, Arizona where during much of the summer, even the overnight low can exceed 100`F.

    • bachcole

      We have a compatriot here (whose name escapes me right now, as do a lot of things that escape the feeble clutches of my memory) from the driest place on Earth, the Atacama Desert. We could use a comment from him just about now. (:->)

      • Obvious

        Perhaps another version powered by the latent heat of evaporation from sweaty hands could be built.

  • Jouni Tuomela

    Aluminium foil is a good heat-reflector, the top of our heads then should be foiled, yes!

    • GreenWin

      Careful you don’t get foiled again.

  • clovis ray

    As, a large amount, of heat exit’s the top of our hears, it would be a good place for this heat consuming device, like in all kind of hear gear like ear phones cell phones, as well head lights .

  • EEStorFanFibb

    It’s been done….

    Ann Makosinski, 15-Year-Old, Invents Body Heat-Powered Flashlight (VIDEO)

  • Gerard McEk

    I would like to know more about the technology (Seebeck??) and efficiency of the developed deltaT to Pel converter. Is there any progress in this area?

  • bachcole

    I like the concept, but it might work better if the whole hand were involved and the radiator was say towards the front.

  • I look forward to the day that these crowd funding webpages will be swapped with innovative ideas to use basic CF technology to produce it’s first humble applications.