These parts work good if you want solid red or green. They are pretty bright, but drop off quickly if you don't view them straight-on. They are advertised as yellow on AC, but that's only true if you look at them head on, and only look at the middle. If you move your head to the left or right, the yellow looks more red or more green. The LED elements are clearly on opposite sides of the LED case. On AC you get one side red, yellow in the middle, and one side green. Note that a 75% green, 25% red duty cycle produces yellow (50/50 produces an orange color). Drop was about 1.8 volts in both directions, at about 20ma.
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