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Solar Cell Efficiency

Only 1% of the light landing on the first solar cell was turned into electricity. The first commercial solar panels in the 1950s improved this to 6%, but continued development has pushed the efficiency of modern devices to nearly 20%. Researchers are now working with novel materials having efficiencies above 25%.

Solar, Windup, Dynamo, and Faraday Powered LED Torches and Gadgets
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Rechargeable Wind-Up Torch & Bicycle Light

13.99

Handheld torch with magnetic bicycle mounting bracket. Built in dynamo mechanism, rechargeable batteries, and a DC output socket.

Three ultra bright LEDs
Use as a handheld torch and a bike light
Secure fixing / quick release magnetic bicycle mounting bracket
Built-in rechargeable batteries and dynamo
Pull out handle and rotate to charge (two rotations per second)
One minute yields up to 30m of light
Boxed with instructions
Cable to charge other devices (instructions not provided)
Save a fortune in batteries with this light
Rainproof
On-off button
Dimensions: 150mm x 55mm x 50mm
Due to the brightness of the LEDs this torch is not suitable for young children.
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