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Advent calendar, Christmas is coming!View Instructable »
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Sorry I left this message unreplied... you are right, the LEDs I used aren't the most efficient ones, but I had them around from another project. Anyway, the problem with the "high power" LEDs is that they require stronger currents (12-14V), or then use the 6V (5W) ones, which are quite dim too... anyway, I will add a comment in the instructable, I think you have a very good point!