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Full Function Dynamo Light for Around $20
One way to get a full function dynamo light, with a proper beam pattern,
is to use a Schotty-diode bridge rectifier and DC-DC converter to drive a rechargeable light. I just received such a light from Amazon. I tried operating it with no battery, from a 500mA DC source (at a wide voltage range), and it works fine. Current consumption is as follows: 500mA high (I'd estimate that it's 350 lumens, advertised at 500 lumens) 140mA low 270mA flash I am going to use a DC-DC buck-boost converter to provide a constant voltage from the dynamo. The dynamo limits the current output by design so I don't need to use a constant current converter. The light output is less without the battery, but still superior to most dynamo lamps. With the battery charged that light output is much better than all but the most expensive dynamo lamps. The spot to flood capability is very useful. I can already anticipate one person turning red and screaming “cheap Chinese flashlight,” but the reality is that this is a much better system in terms of functionality, output, build quality, beam pattern, and cost, than any sub-$100 dynamo light on the market. Is it as good as a $200 Supernova E3 Pro 2? No, though it does have the advantage of a daytime flash mode and being able to be used as a repair light. You can charge the battery from the dynamo (with the light off) or charge it from the mains. You won't ever be left in the dark with a dead battery because it will work off of a dyno with no battery at all. With six bicycles with dynamo wheels I'm not going to be buying five SuperNova E3 Pro 2 lights. When I have it hooked up to the dynamo in a couple of weeks I'll give another report. The Amazon link is http://www.amazon.com/dp/B008261UOO. I ordered it from the vendor offering Amazon Prime shipping and it came the next day. |
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#2
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Full Function Dynamo Light for Around $20
OK how bout a multiple color blinkie set for attachment to a vest ?
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