Upcoming gravity light - still in initial stages

[sethorly]

http://www.huffingtonpost.co.uk/entry/g ... _hp_ref=uk

TLDR: Lift up a weight -> generates 20 minutes of light (small lamp).

I get the impression the benefit of this particular invention is that it doesn't need batteries, which they say are the costly and low life-expectancy bit of any light system.

[womble]

And lifting a 10kilo weight a metre or two is a faster and probably more efficient means of storing energy than winding away furiously at a clockwork/flywheel crank.