Instead of using standard incandescent bulbs, consider using either fluorescent or tungsten halogen bulbs. In addition, fluorescents last almost 10 times as long as incandescents, for a double benefit. Today's fluorescent lamps come in a variety of shapes and sizes to fit many different applications. The newest development in fluorescent lighting is low wattage, lamps in shapes and sizes similar to incandescent.
Several types are available.
These ballasts have a rated life of 45,000 to 50,000 hours. Direct-wire adapters also are available. When the lamps burn out, the ballast must also be replaced. Circline lamps are fluorescent tubes formed into a circle and designed as direct replacements for incandescents. The following table shows a few typical incandescent lamps and the appropriate fluorescent replacements.