Revolights Arc turns a bike's fender into a speed-detecting brake lightView gallery - 3 images
Revolights is a bicycle lighting system that first came to our attention three years ago, in which the front of the front wheel lights up to serve as a headlight, while the back of the rear wheel illuminates to act as a tail light. While it's a clever setup, at US$229 for a full kit, it's not cheap. That's why its designers have just announced a more affordable alternative called the Revolights Arc, that combines a tail light and wheel-speed-activated brake light.
The Arc can either be attached to an existing rear fender or purchased already built into one, depending on which option buyers go for.
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When the rider is just cruising along, the Arc's two LED light pipes either flash on and off or shine steadily (user's choice) just like a regular tail light, although offering up a larger illuminated surface than most. Thanks to a speed sensor at the back of the device, however, it can detect when the rear wheel suddenly slows down, and at that point becomes a brake light. It then indicates that the rider is stopping by getting brighter and (if applicable) blinking more rapidly.
The Arc is powered by a lithium battery, that can be taken out and recharged via a computer's USB port. A charge of under two hours should be good for about eight hours of use.
Down the road, Revolights also hopes to incorporate a turn indicator function, which would be wirelessly activated using a handlebar-mounted controller.
As with its previous two products, Revolights has turned to Kickstarter to fund commercial production of the Arc. A pledge of US$69 will get you the light itself (that you apply to your own fender), when and if they're ready to go – the planned retail price is $89. The complete fender requires a pledge of $109.
A demo of the Arc can be seen in the pitch video below.