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 13-watt compact fluorescent plug-in 2-pin light bulb offers 720 lumens of light output and a color rendering index of 80. It has an average lamp life of 10000 hours. The 6500K super white color temperature produces a clean bright light similar to daylight. The PL13/SP50K fits a GX23 2-Pin socket.