African violets can be easily grown using artificial light. An intensity of approximately 600 foot-candles for 14 to 16 hours per day is recommended. Inexpensive timers are available to automatically turn lights on and off. Fluorescent lights are most frequently used and can be arranged in tiers or attached to shelves for a convenient and attractive light source. The tubes should be 12 to 15 inches above the tops of the plants.
Several companies manufacture fluorescent tubes specifically designed for plant growth.
The light emitted contains more usable radiant energy. One or two incandescent bulbs may be used with the fluorescent tubes. Standard incandescent bulbs alone are not recommended as a light source because of their poor light spectrum and the heat they produce. Specially designed incandescent spotlights are available for plants in 75 and 150 watts. They provide useful levels of light energy when located about 12 to 18 inches away from the plants.