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pondering about lighting

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pondering about lighting

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Old 12-08-04, 12:51 PM
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robertsdvd
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pondering about lighting

so I've seen these things called shakelights (http://shakelight.notanumberinc.com/flashlight/) ... anyone know how vigerously one needs to shake them? I was trying to think of a way to make them work perhaps as a bicycle light... what if the magnetic generator was built into the crankarms somehow... as they spin around - the magnets would go up and down - and theoretically produce energy to power lights - no? Would this be less efficient than a lightspin bottle geny or a dynohub? Just musing... you know - as opposed to doing real, actual work.
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Old 12-08-04, 04:36 PM
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I have seen flashing LED tail lights that have a magnet mounted on the spokes to generate the electricity to flash when it passes the light. It is not very bright and you would need a magnet mounted on every spoke to get a continuous light - very heavy. Since LEDs take so little current - I dont see the cost or weight of batteries as a problem.
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Old 12-08-04, 06:38 PM
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Unless the generator mechanism were more efficient than a hub mounted generator, which is very unlikely, all energy required to run a generator light must ultimately be provided by the rider. It doesn't matter how the generator is activated, if it requires 1 watt of input power, you, the rider, must supply that watt.
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Old 12-09-04, 07:55 AM
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My concern would be that these things are probably not very bright at all. Consider that wheel driven dynamos and dynamo hubs will only drive a 2.4 to 3W light then picture how much light one of these little things will produce.
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Old 12-09-04, 09:36 AM
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Actually guys there is a new breed of dynamo style lights coming out. http://www.treehugger.com/mt/mt-tb.cgi/441
They need less power and even have a backup battery for those times when you aren't pedaling.
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Old 12-09-04, 06:12 PM
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Originally Posted by larue
Actually guys there is a new breed of dynamo style lights coming out. http://www.treehugger.com/mt/mt-tb.cgi/441
They need less power and even have a backup battery for those times when you aren't pedaling.
Do you have any more info on this? The official site is almost completely lacking in information -- I can't even figure out how and where it would attach to a bike.
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