Uploaded April 2014 | Updated September 2026, 3 weeks ago

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My homemade/DIY gravity light/gravity generator, that uses falling masses to power an LED as a reading light. The Gravity Light was invented by two fellows from Deciwatt for replacing kerosene lamps in remote villages.

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See also:

*** Now up to 8 minutes run time with only a 2 1/2 foot / 0.75 meter drop. Raising it to the ceiling would give 15 minutes. See the following video. ***
Gravity Light - Making and Enhancements (version 1)
youtu.be/6vwcIO9M-uE

Gravity Light (v2) Homemade/DIY
youtube.com/watch?v=foqqxqW8aBg&list=PLFsZmHTZL-zn3jrI0X0e0aRijWlyvfg8h

Shadow wars/solar site survey Shade Finder tool
youtu.be/44NAXcA22Mg

For more about this gravity light, along with some calculations see my webpage:
rimstar.org/science_electronics_projects/gravity_light_homemade_diy_v1.htm

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Music used throughout:
Sneaky Snitch Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/by/3.0
ISRC: USUAN1100772