The Hi-Tech Lamps part number CF9D/841-U is a 9 watt (9W) double tube compact fluorescent lamp made by Ushio. It has a maximum overall length of 108mm with a G23-2 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 525 lumens (525 lm). It is intended for operation using a standard CFL ballast. This lamp is also known as Ushio CF9D/841 and 3000184.