Spectral power distribution

Spectral power distribution is like a map of different colors of light. It tells us how much of each color there is in a certain amount of light. For example, it will tell us how much light is red, how much is blue, and how much is green. This is important because different colors of light affect how things look. For example, if there is a lot of blue light, things may look bluer than if there is more red light.