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Lloyd usually covers the 'just what we needed dept,' but I can't really let him have all the fun, so in the spirit of 'just because we can doesn't mean we should,' here's an LED lamp that doesn't need batteries or a plug, but instead uses tea lights to generate electricity.
This lamp doesn't have a cord or battery pack to light up its LED bulbs, but it does need a steady supply of tea light candles, which each provide about four hours of illumination, thanks to the inclusion of a device that takes advantage of the thermoelectric Seebeck effect to generate electricity from the heat of the candle. According to the company, a single candle puts out about 1 lumen, but when coupled with the Lumir C, the lamp produces about 15 lumens from its LED bulbs, in effect multiplying the illumination of a tea light to a level bright enough to read by or to light up a table.