Linear Fluorescent Bulb, Bulb Base Type Miniature Bi-Pin (G5), Bulb Housing Glass/Metal, Bulb Shape T5, Color Rendering Index 85, Color Temperature 5000K, Lumens 4,800 lm, Light Technology Fluorescent, Nominal Length 4 ft, Shatter-Resistant No, Watts 54 W, Voltage 120V AC, Standards TCLP Compliant, Bulb Minimum Starting Temperature -20 Degrees F, Bulb Start Type Rapid, High Output Yes, Overall Length 45 1/4 in, Rated Life 30,000 hr, Bulb Power Source Requires Separate Ballast