Uploaded August 2014 | Updated September 2026, 3 weeks ago

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How to make a gravity light/gravity generator that powers an LED using the force of gravity with falling masses turning a generator. Now with a 12 minute run time for a 4 foot / 1.2 meter drop. The enhancements in this video include much more efficient LEDs and a stiffer stand that allows me to use the smallest sprocket on the bicycle wheel with plenty of mass.

(Oops. at 2:04 the 1N5882T should be 1N5822T.)

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See also:

Gravity Light - Making and Enhancements (version 1)
youtube.com/watch?v=6vwcIO9M-uE

How to Make Joule Thief Light a CFL - Jeanna's Light
youtube.com/watch?v=yz_99oVMbSI

Peltier Module Cooling - The Peltier Effect
youtube.com/watch?v=9Cuh2msd2lo

Make Solar Cell Transistor Powered Calculator using 2N3055
youtube.com/watch?v=2bUc8RqSFXs

My main webpage about my gravity lights is here:

rimstar.org/science_electronics_projects/gravity_light_homemade_diy.htm

and the webpage about the making of the sturdy stand and its base is here:

rimstar.org/science_electronics_projects/sturdy_mounting_post_pole_stand.htm

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A Darker Heart - music by audionautix.com