when doing your calculations ALWAYS use 14.4v as input.
That being said, what value resistor did you use? there's many variables to what value and having the wrong value can be just as bad as not having resistors. white leds typically have a forward voltage of about ~3.2v, and also how many are you putting in a series? Just need to do a couple simple calculations.
there's a lot of ppl who say they use resistors so everything will be fine, but that's not nearly good enough, the value make a big difference.
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