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This design uses the seawater battery principle. Put a lamp tube with both anode(Fe) and cathode(Al) into a bottle that is filled with seawater or salt water then tighten the cap, which formed the primary cell. The electricity produced by the reaction of the oxygen in the seawater and the aluminum on the tube. When no use, put it in the empty bottle, there is no reaction so no worry about the problem of the leak occurred or attenuation or pollution like other batteries. New life is given to the discarded water bottle as it could be a lampshade. At the same time the electricity power of this light comes from the nature. It is clean and cheap.
wu xi, China
Le Li Long Li Xiang-fei Ran Xiao-ming Yang Bing Zhang