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What sucks, is that with .1 of a volt less potential your LED array would probably still be shining bright. LEDs have a sweet spot, at which they produce about 50 lumen's/watt, but when overdriven they enter unstable territory with more heat than light produced, if you stick an LED to a 9v battery it will be very bright for about a third of a second, then be gone, in order to get a little more power out of an array with out any added manufacturing cost they simply turn the voltage up a touch, they probably have a potentiometer in there somewhere and its probably a matter of a single turn of a small screw driver.
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