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The RGB version of these creates colors by blending the three LEDs. White is achieved by turning on all three colors at the same level of intensity. In practice, if you get close enough, you'll see color in the white - it's not absolutely pure white. There are Twinkly strings that are RGB-W which include a 4th diode that's pure white. I assume that this would make purists happier, but for me, the white you get from RGB is fine. IMPORTANT: The RGB and RGB-W strings can't be grouped together. That is to say, if you're covering the front of your house with multiple strands and want an unbroken rainbow, you need to get everything either RGB or RGB-W. As I understand, if you have RGB set(s) on your house and RGB-W set(s) on your fence, you can run different (unsynchronized) programs on each set. (A rainbow here, sparkles there - or rainbows on both, but they would flow smoothly from one to another, it would be two separate rainbows.)
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