Linear Fluorescent Bulb T8 Bulb Shape 4 ft Nominal Length 47 3/4 in Overall Length Medium Bi-Pin (G13) Bulb Base Type 5000K Fluorescent 28 W 2 515 lm Ballast Dependent Shatter-Resistant No Rated Life 50 000 hr Bulb Primary Application General Purpose 1 in Bulb Dia Color Rendering Index 80 Bulb Start Type Rapid Bulb Type Linear