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Just kidding with the EE.
You don't need to know the polarity on bulb holder until you put them on. I put all the LEDs in, plug the harness back, turn on the light and see which one doesn't light up. Pull it out turn 180 deg and put them back on. You'll need to angle the LEDs to remove bright spot anyway.
Like I said don't run the LED with too low current, they'll burn out faster. Run them as close to spec current as possible.
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