The most important aspect of setting up grow lights for the green house is purchasing the grow light that will satisfy the needs of the crops. The most commonly used grow light is a high output fluoresce lights and setting up this lamp will be discussed in this article. Positioning the lamps above the crops is very important and a critical aspect of setting up the grow lights which is usually six to eight inches above the head of the plants. If the plant is made to receive enough light or even more than that will ensure a healthy grow of the plants but if they are positioned less than the critical value then there is no use in lightning the plants in indoor cultivation. The angle which the radiations create is very vital which means the focal length of the light should be exactly on the surface of the leaves of the cultivated plant. Understanding the plants behavior to the lights is another crucial part successful harvesting, if the plant has received sufficient light energy then switching off the lights will save power as well as any damage to the plants.