RGBWW (aka RGBCCT or RGBCW) comes with cool & warm white temperature LEDs. Marketing states instead of standard 16M colors (2^8^3) that is now allows over 1T colors (2^8^5). Some even come with only a cool or only a warm white LED.
I don’t understand though, RGB can mix to form different temperatures of white on its own.
Televisions/computers/phones only use RGB (or BGR).
In: 6
The reason you need “white” (be they warm-white or cool-white) LEDs for lighting, rather than just mixtures of RGB has to do with *colour-rendering*, or colour-rendering index (CRI).
Although you can make apparently the same colour of white light with a white LED or matching it with some mix of RGB, the white LED has a *broad spectrum* from red through to blue, whereas an RGB-mix only has wavelengths at very specific narrow Red Green and Blue wavelengths.
RGB-white is ok for a TV or display-screen, but when you use the light to illuminate real objects, such as people (skin-tone), upholstery, clothes, food, … the colours get distorted. Some fabrics or food will look dull and drab, and other colours (where the reflectance matches the wavelengths in the RGB LED) will “pop” and look gaudy and almost fluorescent (like the stage-lighting typically used for pantomime!).
(Source: I used to work in display-screen colour measurement)
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