Game changer: Magnic Light

Springtime a year ago we were pleased to contribute to a Kickstarter campaign for a new kind of bike light called Magnic Light. There was a lot of speculation voiced in various forums whether it was a hoax, because the physics involved defied most peoples' understanding. If this very simple invention was for real, why hadn't it already been invented? "Everybody said 'that's impossible.' Then somebody came who didn't know that, and did it."

We're happy to have received our first shipment straight from inventor Dirk Strothmann in Germany, for sale right now. Wait, it's August, not even dark until late? More about that in a bit. I've got them on the only bike I own without built-in lights, a Brompton. Everybody who likes playing with magnets, magic tricks, or seeing and being seen on a bike smiles, and some even laugh in amazement to see Magnic Lights work. Come by for a demo.

Now is ze time that we look (advisory: techno soundtrack):

Magnic Lights are very bright, lightweight, incredibly efficient bike lights that use no batteries, are self-contained, and don't require building a wheel around a dynamo hub. This makes them a game-changer, I dare say historic because I think someday most bike lights are bound to work similarly. All you do is position the small light units in proximity to any normal metal bike rim, and they work. Unlike superficially similar "be seen" products like Reelights, these don't require mounting magnets in your wheel, and are plenty bright enough to be your only lights. This is the jaw-dropping part: just the motion of the metal rim itself, not magnetic or even necessarily ferrous, is enough to power the lights. No contact or noise, no external parts or wiring, lighter weight and an order of magnitude less drag than the very most expensive dynamo hubs. There's no such thing as free energy, but any resistance created by Magnic Lights is utterly negligible, even with a wheel turning free in a stand, for minutes. They boast the brightest dynamo taillight on the market (aim carefully please!), and while the headlights don't measure up in brightness or beam shaping to the best available, they aren't too shabby either.


They run about $250 for a set of 3: 2 headlights and a taillight. That's more than most battery systems, but less than most dynamo systems not built in at the factory. And if you are really focused on high efficiency and light weight, whether for practical, aesthetic or obsessive reasons, Magnic Light is simply the best bicycle lighting system there is.

This concept could not previously have been realized practically because only recently have rare earth magnets become powerful enough, and LEDs efficient enough, for supply and demand to meet, so to speak. It turns out that any conductive material such as an aluminum rim - not just magnetic or ferrous - will produce so-called eddy currents when moving through a magnetic field. This invention harnesses these currents to turn a tiny generator without contact.

There are some issues. The biggest for people like us who use bikes to carry stuff is that since the lights and the generator units are integrated, they can be mounted only in locations that provide the correct small rim clearance and good light placement simultaneously. The provided mounting hardware doesn't have an answer for rear racks, whose mounted luggage will block the light. If you don't have either a skinny-tire fenderless road bike (Portland?!), or a bike with cantilever brake studs, there are only somewhat compromised mounting options. What's more there's no standlight, so you go dark when not moving. We'll make sure you understand all these issues before selling you a set: please bring your bike if at all possible.

We're pretty sure it's just a matter of time before the technology makes its way into more form factors, with broader feature sets. How about a stand-alone generator you connect to fork blade or seatstay that has power out for standard lights and other electronics? For now, for many, being an early adopter of the first, purest expression of the idea is part of the appeal.

What's wrong with cheap simple battery lights, anyway? No matter how much better they are than, say, 10 years ago, the inescapable reality is that the more you use them, and the brighter they are, the faster they burn out. The bigger the battery, the heavier and more fragile the light when dropped. Nobody would accept this dynamic in any other form of transportation. Battery lights are essentially disposables, at odds with the sustainable elegance of bicycles that can serve for decades.

What dynamo lights bring to the table, that battery lights never will, is liberty to run them IN THE DAYTIME. All the time, without a care in the world. With no bulbs to burn out and no resistance perceptible, why not? Tipped up just a bit, today's brighter LED lights are conspicuous a mile away in broad daylight! No battery light is bright enough to be useful in daytime without committing the user to a really onerous recharging scheme all the time. To my thinking, that's a better single safety investment than a wardrobe full of day-glo plastic garments and even a crash helmet for non-sport biking, because it can ward off rather than mitigate collisions. Our experience running bright daytime lights supports the conclusion of studies conducted with motorcycles, that they draw significant notice from other road users, preventing right-of-way violations in particular.

One last thing: one reason that battery operated lights have remained popular, apart from their lower initial expense, is that they can easily be transferred from bike to bike. If you care enough about safety and convenience to value the benefits of generator lighting, there's a good chance you own more than one bike. But then, equipping multiple bikes with generator lighting can be prohibitively expensive. Magnic Lights can be moved from one bike to another in seconds with no tools: only the inexpensive mounts need installation in advance.

One of the better early reviews:

5 thoughts on “Game changer: Magnic Light”

  • Jon W

    I too supported the Kickstarter light. I signed up for 2 sets. I quickly has 2 of the mounts break. The mounting design is very weak based on 1 very small #4 bolt. The weight of the light vibrates and breaks the mount . The lights hit the ground & break. Also the lights are not vey bright. I compare them to about a 150 lumin light. My review is not ready for prime time.

    • admin

      None of the 10 sets in our initial stock (now sold out awaiting new production) have suffered this fate, Jon. I agree that the mounts could use some improvements, and it's clear that the product is still developing rapidly. In correspondence you suggested it was unreasonable to require a torque wrench for a #4 bolt, and I admit I have never used one myself (I am not a mechanic, just a hack). But your experience of both mounts breaking suggests that probably indeed you overtightened, fracturing the plastic which led to failure with vibration. (No shame: I snapped about 6 seatpost and handlebar binder bolts over the years before my biological torque sensor got dialed.) As for brightness, the lumens are actually pretty high; it's the lux (light density) that's low relative to a lot of the better lights out there. The upside is that with all the spill, they are pretty great for being seen. That's the headlights. The taillight is wonderfully bright. A little bird tells me that there will be major improvements coming the headlights soon.

  • Franklyn Wu

    Hi, Clever Cycles,

    Carlos Duque and I are part of the same rando club in the Bay Area, and through reading his blog I came across Magnic Light. I contacted Dirk to ask some question regarding mounting options compatible with a small front rack like a Nitto M12. My bikes all have a front rack and fenders, and I am trying to figure out what's the best mounting option for Magnic light to use with the front rack I have. Any thoughts?

    By the way, what I really want is 4 front light and no rear light at the moment, what's the cheapest way for me to purchase this combo?


  • Michael

    I really wanted to know if these would fit on a Brompton without messing up the fold. Thanks for clarifying! I've been pretty excited about this since I first saw the Kickstarter.

    • admin

      Michael, they fit on Bromptons but the left front headlamp must be removed to complete the fold; this is easy. The taillamp mounting requires modifying the mount and bending a fender stay a few millimeters out of straight.

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