U-Bend Fluorescent Bulb T8 Bulb Shape Medium Bi-Pin (G13) Bulb Base Type 22 1/2 in Overall Length Bulb Bend Radius 1 5/8 in 1 in Bulb Dia Fluorescent 4100K 2 440 lm 31W LFL Wattage Equivalency 31 W Watts 120V AC Bulb Type U-Bend Trade Number F31T8SPX /U/ECO 30 000 hr Rated Life Shatter-Resistant No Color Rendering Index 85 Bulb Minimum Starting Temperature 50 Degrees F Rapid Bulb Start Type ANSI Code 78901-ANSI-4027-1 CEE Certified No