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dynamo hubs
Last Post 01/23/2014 02:59 PM by 79 pmooney. 26 Replies.
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THE SKINNY

Posts:423

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11/12/2013 10:23 AM
3300 lumens? do you set things on fire if you point the lights at them too long?
How we spend our days is, of course, how we spend our lives.
Oldfart

Posts:489

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11/12/2013 12:07 PM
Skinny: When it is wet our soil is really dark. It is a good thing to have lights that go to 11 if you need to.
jmdirt

Posts:731

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11/12/2013 04:27 PM
Update: I have a 7 year old Cat Eye Opti Cube 200 that has become the Jido 230.

http://www.cateye.com/en/products/detail/HL-AU230/moreinfo/

The auto feature and the easy adjust mount are new, the case is slimmer, and they added a bit of brightness. Its a crazy good deal for $25 on Amazon.
Orange Crush

Posts:1234

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01/22/2014 11:55 AM
Here's a dynamo based permanent light system that looks very interesting; and its won some safety awards. My LBS started carrying it; will have to check it out.

http://shop.reelight.com/bicycle-lights/20-rl700-set/
79pmooney

Posts:1189

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01/22/2014 12:33 PM
O.C., interesting. There is one thing about their description that I find a little disconcerting. "No friction" What I want to know is how much does this light slow me down, esp the one that stays on all the time. If it indeed does not slow me down, then with a little ingenuity, I should be able to rewire the generator to say a BB mounted (Cancellara style ) motor. Later editions could have the magnets upsized until the power generated exceeds pedaling power. The dream of inventors forever.

Ben
Orange Crush

Posts:1234

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01/22/2014 12:53 PM
Ben - I guess no friction compares it to the dynamos of old - see the picture I posted near top of thread.

Say your name is CK, you put out a measly 200 Watts (give or take). A typical modern bright bike light may be on order of 2 Watts. So you lose about 1% of your power output to being safe assuming 100% efficiency of the lighting system, which should be pretty close for a non-friction based system such as this.
Sweet Milk

Posts:93

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01/22/2014 01:01 PM
No _mechanical_ friction
THE SKINNY

Posts:423

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01/22/2014 01:28 PM
i like 'em. i wonder if they stay on for a few minutes after you stop pedaling? like at a stop sign or walking your bike into the garage at night.
How we spend our days is, of course, how we spend our lives.
Orange Crush

Posts:1234

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01/22/2014 01:36 PM
Posted By carl x on 01/22/2014 01:28 PM
i like 'em. i wonder if they stay on for a few minutes after you stop pedaling? like at a stop sign or walking your bike into the garage at night.


5 minutes
79pmooney

Posts:1189

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01/22/2014 01:41 PM
At 620 grams, I'm going to bet there is no battery, hence no light when not moving.

A 2 watt light will require more like 4 watts power to generate the electricity. And being an old skinny climber with probably half the flat ground power of say a CK, we're talking about a 4% toll.

Ben
longslowdistance

Posts:723

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01/22/2014 09:27 PM
Barely 2 cents worth of advice here: Bicycle Quarterly rigorously reviews dynamos - may be another useful info source.
79pmooney

Posts:1189

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01/23/2014 02:59 PM
I poked around their website. The flashing units use about a 1/4 watt which they claim adds up to inches elevation gained per mile. Elsewhere, they talk of studies showing much reduced accident rates in daytime using these lights. (My observation: obnoxiously bright jerseys without patterns work better still but any pattern will act as camouflage in the right lighting - often in bright daylight under trees.)

Ben
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