Sunlite, 250 high wattage Incandescent medium based R40 heat lamp bulb works with most 125 volt lighting fixtures, and will last for an average of 3000 hours. This bulb features a clear finish that provides a bright, crisp light. Incandescent lighting is commonly used for decorative, office, residential, commercial and special purpose lamps. These bulbs are also great for decorative and special purpose lighting applications.