The Hi-Tech Lamps part number CF13D/841-U is a 13 watt (13W) double tube compact fluorescent lamp made by Ushio. It has a maximum overall length of 118mm with a GX23-2 two pin CFL base. The average lifetime is 10000 hours, it has a color temperature of 4100 Kelvin (4100K), with a nominal luminous flux of 780 lumens (780 lm). It is intended for operation using a standard CFL ballast. This lamp is also known as Ushio CF13D/841 and 3000140.