12 Watt LED retrofit replacement lamp for existing 4-Pin Compact Fluorescent systems currently utilizing compatible Programmed Start CFL ballasts. Equal light output up to a 32 Watt Compact Fluorescent plug-in 4-pin Lamp due to optical features. Has 4000K cool white color temperature. This is a true plug-and-play solution that works off the existing CFL ballast. For vertical orientation. Existing fixture compartment dimensions must be minimum 4" diameter and 5.5" height.