A lot of companies are competing for the “shake” or “no-battery” flashlight market, but Valor makes a $10 version that’s both more efficient and much less expensive than many of the other offerings. While other companies promise only four to five minutes of light for 30 seconds of shake, Valor boasts that their light’ll provide 100 minutes of light for just 60 seconds of shake — for a survival/”green”/no-battery light, that seems reasonable.
They probably don’t compare to battery-powered lights for brightness, but that’s a tough comparison since the products have totally different application niches. One of these babies could sit in your barn, tool shed, or boat for 50 years, and when you need it, you just shake and point. You don’t have to worry about the batteries corroding in the case — no need to even think about it until you need it.
Ever since these “shake” lights hit the infomercial circuit, I’ve been looking for a really good one, and this at least looks passable. If you have one that you like, or if you know any DIY tips for how to build one, or if you’re interested in seeing a Hands-On or comparison of them — please post in comments.