system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does mixing lights result in a different color than mixing paint?

for example green + red = yellow in lights, and brown in paint. why does this happened.
gpt
Mixing light together is simple addition. Adding red light to green light gives you yellow light, add in blue and get white light.

Paint, on the other hand, is about absorption and reflection. Yellow paint absorbs blue light, and reflects red and green. Red paint absorbs green and blue light, and reflects red. Mix them together and you get a paint that absorbs blue light, absorbs half of green light and reflects the other half, and reflects red: orange paint.