Two is less than one? Hack solar garden lights notes that putting two LED’s in series reduced the garden light current draw from 7.59 to 5.65 mA without any significant drop in luminance. The solar lights described use NiMh – that must be a British thing as most here in the U.S. use NiCd due to the charge and discharge requirements.
Big Clive also sells kits for a lot of LED type projects. Looks like fun!
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