Typically RGBW means nondescript white, RGBWW means “Warm White”, RGBNW is “Normal White”, RGBCW is “Cold White”… unfortunately some sellers have since started to use RGBWW as 2 whites causing confusion, always need to dutifully check what you buy…
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Does that mean there are pixel strips around with all of those combinations?
Can WLED support all of them, without any issue?
Well all the first 3 are the same, it’s just the color temp of the white chip that changes and wled doesn’t care about that beyond “there’s a 4th LED”.
The latter is usually referred to as RGBCCT and yes WLED supports some.