Plants get their energy from light, but you might not know that different colors of light have different energy levels. Think about the colors of a rainbow. All of these colors are in white light. While using a prism you can separate the white light into the colors. (That’s what the raindrops are doing when we see a rainbow.) At the purple, violet & blue end of the scale the light is at its highest energy. It has short wavelengths. The red end is lower energy, it has long wavelengths. What wavelength goes with with a colour?