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I need to string together to lines of 6 Led bulbs each together the leds I bought came with resistors but I see projects that don't or I can't see any resistors so My question is do I need to put resistors in the string or before each bulb or...and can I run 6 leds with a battery?like 2 AA's or a 9 volt or something. or go with a hard wired 5V transformer type plug in?