No light - no life. Light is to plants as food is to us, neither can live without energy. Plants are superior in that they get their energy directly from the sun - we get our indirectly through plants or animals. The Fast Plant is hungry for light all the time, because it is genetically coded for fast growth and "eats" light 24/7 to grow. The light that keeps the plant and us alive comes from the sun. However, we have learned to make our own light from electricity using a compact fluorescence light bulb that mimics natural daylight. With the light box, the brightness and time of indoor light can be controlled. The light box can make the sun stand still as far as the Fast Plant is concerned.