The Hi-Tech Lamps part number CF5S/841-U is a 5 watt (5W) single tube compact fluorescent lamp made by Ushio. It has a maximum overall length of 108mm with a G23 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 250 lumens (250 lm). It is intended for operation using a standard CFL ballast. This lamp is also known as Ushio CF5S/841 and 3000147.