system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does a single LED produce multiple colours?
gpt
They don't. Each LED junction can only produce one wavelength, in fact, LEDs are famous for their narrow bandwidth. When we want a multicolour LED, what we do is embed a red, green, blue (and optionally white) LED junction on the same device very close to each other. By mixing the amount of these 3 colours, we can convince our brain that it's actually a single colour.