Figure out how much light your plants need and if you are growing from seeds, read the directions. This will determine the wattage of the light bulb that you choose. Use a higher-wattage bulb if plants need a lot of light and lower wattage for those that need less. Do not use a bulb less than 20 watts because it will not emit enough light.
Screw the CFL into the light lamp. Set the light lamp one to four inches above the plant--no farther away or not enough light will get to it. Do not let the light bulb touch the plant or it will burn the leaves.
Place a light deflector around each lamp to direct the light toward the plant. This will maximize the light output, since CFLs are not as powerful as high-intensity discharge (HID) lights or typical growing lights.
Use the daylight type of CFL when the plants are in the vegetative or early stages of growing, because at this point they do not need as much light as they will later.
Switch the light bulb to soft white for the flowering stage of the plant if it flowers. Soft white is similar to a high-pressure sodium or HPS light, which gives off more light and is better suited for the flowering stage.