From the ManufacturerSunlite compact fluorescent plug-in lamps are used with external electronic ballasts. They are available in a wide range of sizes, wattages, color temperatures and pin configurations. This Sunlite 26-watt compact fluorescent plug-in 4-pin light bulb offers 1800 lumens of light output and a color rendering index of 80. It has an average lamp life of 10000 hours. The 2700K color temperature produces a warm white light similar to standard incandescent bulbs. The PLD26/SP27K fits a GX24Q-3 4-Pin socket.