The practice of supplemental lighting is the use multiple types of grow lights designed to accomplish different growing objectives. The primary indoor garden lighting strategy involves the use of overhead grow lights to provide light for the growing area. Supplemental lighting can simply be adding more light but it is also using light that affects plants beyond photosynthesis. Light colors are actually light frequencies; different light frequencies (colors) will affect plant physiology. So, specific colors/types of light can be used during specific growth phases to improve growth.