Tuesday, August 04, 2015


GravityLight is a pretty neat idea. "GravityLight is unique - it doesn't need batteries or sunlight and costs nothing to run. It takes seconds to lift the weight that powers GravityLight creating 20 minutes of light on its descent."


Karl said...

This is so basic, I'm surprised I haven't seen it before. It's like a grandfather clock, but with light.

Howard said...

Yup. I wonder if a pendulum mechanism wouldn't work better?

Karl said...

The pendulum on a clock is just a regulator. The power comes from the weights (or springs). I'm assuming the light regulates the power through friction of the generator, which would produce a continuous output rather than the oscillating output of a clock (or a blinking light). Using friction has some downsides in terms of wear, and it appears their revised version tries to address these.