The Hi-Tech Lamps part number CF13CLT4100-U is a 13 watt (13W) coiled compact fluorescent lamp made by Ushio.This lamp has maximum overall length of 86mm and a diameter of 46mm The average lifetime is 10000 hours with a much longer typical lifetime in commercial environments. This lamp has a cool white color temperature of 4100 Kelvin (4100K), and has an output of approximately 800 lumens (800 lm). This lamp is also known as Ushio CF13CLT/4100/GU24 and 3000545. This 13W CFL is an ENERGY STAR?? Qualified Product.