DIY, Open-Source Headlamp Design

Bosavi LLC is a Berkeley, Calif., startup company launching a headlamp “designed to be charged from almost any power supply.” On a Kickstarter video company founder Dan Freschl is shown recharging the little white headlamp using a solar unit, a USB computer cord, and some kind of whizzing, cord-pull electro generator that serves as a mini power station in the outdoors.

Founder Dan Freschl with the Bosavi rechargeable headlamp; photo by Joseph Schell

The company’s namesake headlamp was made, Freschl says, to stop wasteful battery usage. It was a design “borne out of years of frustration at the inconvenience and environmental impact of AAA-powered headlamps,” he wrote.

Instead of disposable batteries, the Bosavi has a built-in lithium polymer battery that sits inside a machined aluminum heat-sink that doubles as a reflector for the light. Its beam comes from a 110-lumen LED, which is bright enough for use while hiking or rolling in a city on a bike at night.

Solar charge

Freschl’s project was self-funded and it “relied entirely on low cost tools such as open-source software, salvaged manufacturing equipment and community resources,” he wrote. Work on the headlamp began two years ago, and now this year after a successful Kickstarter campaign that raised more than $20,000 Freschl is looking at a manufacturing schedule that will start soon.

“Bosavi’s story isn’t just about a headlamp,” Freschl wrote me. “But it’s about a new way of creating a business — I have done everything on this project by myself, including the design, development, programming, sourcing, branding, web-site creation, videography, and photography.”

To see Freschl’s neat new headlamp concept, go to Or fund the startup via Kickstarter at this link. —Stephen Regenold

Cord-pull electro generator charging the headlamp

tagged: #crowdfunding

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Stephen Regenold is Founder and Editor-In-Chief of GearJunkie, which he launched as a nationally-syndicated newspaper column in 2002. As a journalist and writer, Regenold has covered the outdoors industry for nearly two decades, including as a correspondent for the New York Times. A father of four small kids, Regenold and his wife live in Minneapolis.