Hi 🙂
Most computer monitors usually have a boring white back-light with LED (or older: Halogen). There are three tiny color filters for each pixel, and a liquid crystal layer that can be controlled to block light or let light pass to some degree. This way the monitor can mix colors.
– https://en.wikipedia.org/wiki/File:Closeup_of_pixels.JPG
OLED monitors have three or more tiny lights to mix colors for each pixel directly. But the principal is the same: You have red, green and blue.
LED lighting usually just has white LED. Some have a combination of warm-white and cold-white in order to adjust color temperature. There are of course RGB light bulbs, strips and such that can mix red green and blue. But these also have three or more tiny LED inside, and not just a single LED.
– https://de.wikipedia.org/wiki/Datei:RGB-SMD-LED.jpg
As the monitor’s base color is black, it can always mix darker colors. A light-bulb depends on the ambient brightness.
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