Photon Torch
Photon Torch: At 7 grams this keychain light has to be about the lightest (adjustable beam) torch (4.5 lumens). Some models are also waterproof. The Maxell CR 2106 batteries for it can be bought from eBay for approx $5 for 10. Each pair lasts 12 hours, so that would be enough light for at least […]