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MadMomma, Here is a quick article explaining the color coding of power pack output wiring. http://reprap.org/wiki/PCPowerSupply I do strongly suggest however that you need to test the lines first. We've found some fairly unstable output readings with some of the power packs we've tested. Basically, you're identifying a 12v positive and a ground wire coming from the PC power pack. Then you need to wire nut and secure those to the positive and negative main wires that will run out to your spots. the PC power pack uses the same wire to plug into the wall outlet that it uses when used in a computer. This is all part of the make and take on the tenth, if you need to do it sooner and on your own, I suggest you have your neighbor show you how to test and identify the output power lines. If not, we'll show you at the make and take.
 

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In our make and take in NJ we went with the more common LEDs for cost. $.08 a piece including resistors. We compared a spot with 3 standard LEDs to a spot with a single high powered LED and the three cheap LEDs over-powered it.
 
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