Photosynthetically Active Radiation, often shortened to PAR, is the type of light that plants need in order to grow. It is important to plants so they can make food, which is what helps them stay healthy and strong. PAR is light that can be seen by our eyes and made up of different colors, which is why it looks white to us. This type of light helps plants turn water, carbon dioxide and nutrients into food. We rely on plants for food, so having the right amount of PAR is really important for the health of our environment.