Linear Fluorescent Bulb, Bulb Base Type Miniature Bi-Pin (G5), Bulb Housing Glass/Metal, Bulb Shape T5, Color Rendering Index 85, Color Temperature 3500K, Lumens 2,100 lm, Light Technology Fluorescent, Nominal Length 3 ft, Shatter-Resistant No, Watts 21 W, Voltage 120V AC, Standards TCLP Compliant, Bulb Minimum Starting Temperature -20 Degrees F, Bulb Start Type Rapid, High Output No, Overall Length 33 3/8 in, Rated Life 30,000 hr, Bulb Power Source Requires Separate Ballast