Reelight Magnet-Powered Bike Blinkers

These may be more common in the world of bikes that I realized, but I like the way the "Reelight" LED bike light works. Instead of using a dynamo to generate electricity like bike lights of the last several decades, the Reelight uses two neodymium magnets to charge a capacitor. Gadget Lab even supposes that more magnets could be clipped onto your wheel to generate extra power, which could in turn be used to top off phones and the like. From what I can tell from reading the Amazon reviews, however, these only blink when the magnets pass, meaning it's unlikely they'd generate all that much power in the first place. It looks like you'll have to stick with the dynamos to power real headlights for now. The Reelight is $40 for a set. Product Page []
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4 Responses to Reelight Magnet-Powered Bike Blinkers

  1. Anonymous says:

    I actually have a magnet-powered light on my bike but it’s in the hub of the wheel. extremely handy although hard to install. (you need to re-spoke the wheel) Light shines brighter than dynamo and practically no friction.

  2. Anonymous says:

    There are versions with and without a capacitor in them if you want to keep blinking when you stop riding.

    The bike shop I work at has them or to order online.

    love me some boingboing.

  3. Anonymous says:

    Coincidentally, Bikehugger posted a review of Reelights yesterday:

  4. Anonymous says:

    I bought some of these for commuting in London (the capacitor version). Spin-up time to the first blink is about 10-20m of rolling, up to about 100m if you haven’t ridden all week. I assume that’s due to losses due to leakage in the super capacitors.

    Alignment of the lights is a bit tricky – you need between 1-3mm of clearance (two adjuster screws), but as the lights + spokes flex slightly the only way is by trial and error.

    After I get home, they seem to take between 5-10mins to stop blinking.
    I like the optics design – the focused LEDs are very bright, but there’s also a diffuser on the front of the coils which makes a nice large ‘blob’ of light by night.

    Only problem is that the light is mounted at axle height – I really need to get some helmet lights as well.
    Also, as you have to mount the rear light on the opposite side to the gears, its probably more visible in countries where you drive on the right…

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