Plus it makes 'em last longer - which is kind of counter intuative.
Don't forget if you're simulating them, the 2s, 3s, and 5s are positioned differently from the 7s.
Also if I remember correctly, they pulse left then right, not both on then both off. And there must be a central controller because they don't seem to go out of phase like the turn signals on a long line of trafic waiting at a red light.
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