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Advice on replacement LED please :)

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http://forum.allaboutcircuits.com – Original part to be replace is a "SML1216W(D)". Its a dual color red and green led on the standby power button on a denon receiver. I'd like to replace it with a blue, single color that only glows when "on". Can someone tell me the voltage and amperage of the led? I'm fairly certain I will be replacing a 3 leg with a 2 leg. Thanks!!!! (Embedded)