Really any size above 7mm will do but i need 36 0f them to run on around 4 volts
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+1What is your city boy, are you close to RenoI have a hundred of yellow can be had for you :-)
its not Reno but thank you though
+2Single colour 5mm leds are generally a few cents each in bulk10mm leds nickles or dimes each.7mm is pretty rare...and where on earth is author getting a 4 volt source?
I am putting together Home phone batteries