Since fluorescent grow lights produce just a fraction of the power of Metal Halide and High Pressure Sodium grow lights, they are generally unsatisfactory for general use. They are useful for starting new plants and for some compact hydroponics projects, but must be placed very close to the plants. To cover a 2′ by 4′ area, you will need a minimum of four 54-watt 4′ fluorescent bulbs placed as close to the growing plants as possible. Even then, results may not be satisfactory and producing fruits and vegetables will be difficult. Still, fluorescent grow lights are well suited for the very early stages of plant growth, and are often used to start new plants.