Globes bulbs are typically used around vanities in the bathroom. An attractive covering or "globe" conceals the spiral inside. The 11 watt CFL globe is equivalent to a conventional 40 watt incandescent bulb and provides 550 lumens of light, while the 15 watt CFL replaces the conventional 60 watt bulb and provides 800 lumens of light. Both have an expected lifetime of 8,000 hours or up to 7 years. Not for use in dimmable lights. The 11 watt bulb measures 3.5" x 5.1", and the 15 watt bulb measures approximately 3.5" x 4.5". Saves you money and energy, and helps the environment, as well.