A B Average Bulb Life: 21,000 hr. , Average Life: 18,000 hr. , Base Type: Medium Bi-Pin (G13) , Bend Radius: 6" , Bulb Technology: Fluorescent , CRI: 90 , Initial Lumens: 2300 , Lamp Designation: F40T12/U/6/SR , Lamp Dia.: 1.5" , Lamp Shape: T12 , Lamp Tone: Cool , Lamp Type: U-Shape , Length: 22.437" , Lumens: 2300 , Max. Overall Length: 22.437" , Mean Lumens: 1955 , Overall Lamp Shape: T , Shatter Resistance: Yes , Shatter-Resistant: Yes , Start Type: Rapid , Watts: 40