Light, when combined with CO2, provides food for plants. The process in which light is converted into growth is called photosynthesis. Without light no plant growth is possible. Successful growing light starts with a carefully considered lighting plan that is custom-made to suit your specific business situation. A lighting plan calculates the best possible coordination of fixtures, reflectors, patterns and distances between the lights and plants. This requires a thorough analysis of various factors, such as the desired light level, the light distribution, the most effective lighting height, the greenhouse structure, irrigation, screening and heating.