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OT free lighting
On 14/08/2013 14:04, Jeff Layman wrote:
On 14/08/2013 09:25, David Hill wrote: Interesting item, can you find a use for it? http://www.di-ve.com/news/invention-lights-world Probably only for an hour or two around midday, and only on the equator. To get 40 - 60 watts equivalent (let's say 50 for simplicity), with the sun directly overhead, you'd need a bottle with a diameter of about 25 cm. I guess that a water bottle for a dispenser wouldn't be far off that, so it is feasible. But it would be heavy (around 20 kg), and a flat piece of glass with the same diameter would do just about the same thing. I think you need to look again at the weight. A full 2 litre pop bottle weighs 2 kg + the weight of the bottle, and this is the size used. |
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