Originally posted by see_fu
bust out a voltage tester. if u hook it up correctly it'll read a positive number, if u hook it up wrong it'll give u the exact same number but negative. I believe the long prong on the led is the positive while the short prong is negative.
i think i'm gonne invest in one of those this week. but the this about the LEDs is that since they are connected in series, there is no long and short prong. they're all the same size, lol