Linear Fluorescent Bulb, Bulb Base Type Medium Bi-Pin (G13), Bulb Housing Glass/Metal, Bulb Shape T8, Color Rendering Index 82, Color Temperature 4100K, Lumens 2,675 lm, Light Technology Fluorescent, Nominal Length 4 ft, Shatter-Resistant No, Watts 28 W, Voltage Ballast Dependent, Standards TCLP Compliant, Bulb Minimum Starting Temperature 60 Degrees F, Bulb Start Type Rapid, High Output No, Overall Length 48 in, Rated Life 45,000 hr, Bulb Power Source Requires Separate Ballast