These 4-pin pin-based SpringLamp bulbs fit in TCX style adapters, which are used in some TCP light fixtures and two-part screwbase lamps. Rated to last for 10,000 hours and have a "warm white" (27K) color temperature. * Dimensions (20w): 2.2" wide x 3.45" long * Light Output (20w): 1,200 lumens * Color Temperature: 2,700 degrees Kelvin * Color Rendering Index: 84 CRI