A G40 bulb is a type of incandescent light bulb commonly used in decorative fixtures. It is characterized by its spherical design and has a diameter of approximately five inches. These bulbs are often utilized in open fixtures to showcase their unique shape, but they can also be used in enclosed fixtures. G40 bulbs are available in various wattages, lumen outputs, and color finishes, providing a wide range of options for different lighting applications. They are frequently found in exposed pendant fixtures, chandeliers, and other decorative lighting fixtures.