GU24 light bulbs do not have the usual screw base, but instead have two bayonets protruding from the base. These insert into matching holes in the fixture's socket, and twist to lock into place. Twist and pull, and the bulb comes right out of the socket. This 27 watt GU24 spiral offers 1750 lumens of light, which is equivalent to a 100 to 120 watt incandescent. Light Output: 1750 lumens (100-120 watt incandescent equivalent) Color Temperature: 2,700 degrees Kelvin (warm white) Rated Life: 10,000 hours Dimensions: 2 3/8 inches wide x 4 3/4 inches long Manufacturer Warranty: 1 year Origin: China