1. Each three LED segment is a complete unit and you can cut on the black line in the middle of every copper pad.
2. You can also cut in the middle of the soldered pad that joins two segments together.
3. With 2811, each segment of three LEDs is controlled as one by the 2811 chip, i.e., the 3 LED will light together. In your software, you will model these as 1 pixel/node. So one 30 LED segment is equal to 10 pixels.
If you want to learn more about various types of pixels, check out You are not allowed to view links.
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