From the Manufacturer Sunlite 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 5000K super white color temperature produces clean bright light. The PLT26/E/SP50K fits a GX24Q-3 2-Pin socket.