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Gravity makes light!!!!

Discussion in 'Off Grid Living' started by rsbhunter, Dec 27, 2012.

  1. rsbhunter

    rsbhunter Monkey+

    tulianr, Mindgrinder and chelloveck like this.
  2. ghrit

    ghrit Ambulatory anachronism Administrator Founding Member

    That is actually quite clever. I see battery charging for cell phones and laptops for possible development planning, as well as lighting. What I didn't see is electrical specs. Put me in the interested group.
  3. kckndrgn

    kckndrgn Moderator Moderator Founding Member

    That looks pretty neat. I would like to know the run time and if the light/energy output is determined by the weight added to it.
    Found the answer:
    GravityLight: lighting for developing countries. | Indiegogo

  4. chelloveck

    chelloveck Diabolus Causidicus

    Instead of a wound up spring (as in some rechargeable torches and radios) to store the energy, a weight is used similarly as for counterwighted clocks....it's an old technology given a new twist.
  5. Altoidfishfins

    Altoidfishfins Monkey++

    Hmm. Wonder if that could be done on a little bit larger scale.
  6. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    Light output is adjustable from gentle glow to work light. and "charge" last from 30-18 minutes accordingly. Video shows what appears to be a vt AA battery sized flashlight hooked up for use as a reading light. No battery in the unit. Limited use, but would have value in an attic, shed, or short time location.
  7. Altoidfishfins

    Altoidfishfins Monkey++

    Since he's running a LED, I wonder if a super capacitor couldn't be charged at the same time that the weight is falling. When the weight reaches the floor, the LED could then continue to draw current from the super cap thereby extending the run time.
  8. kellory

    kellory An unemployed Jester, is nobody's fool. Banned

    There is no free energy. To charge a cap, would diminish the light output. At high output, it will drop in 18 minutes, at low output, 30 minute.
  9. Altoidfishfins

    Altoidfishfins Monkey++


    I was thinking along the lines of building one with enough capacity to do both. It would also require a little more weight. A 25 lb bag of #7 1/2 shot comes to mind.
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