If you are able to place your fluorescent light setup near a sunny window, your orchid flowering chances will increase. Keep lights on for a minimum of 12 hours per day in order to provide the minimal amount of light necessary for proper growth and flowering. Each group of orchids will need a minimum of two forty-watt fluorescent light tubes hung six inches above the plants. Most orchid hobbyists find having at least four 36″ or 48″ fluorescent tubes provides excellent light levels. You can grow and flower many types of orchid delivery in the darkest basement or shadiest apartment with the addition of just one shop light. If you have neither a greenhouse nor the proper windowsill conditions, fluorescent lighting provides good results.