Linear Fluorescent Bulb, Bulb Base Type Recessed Double Contact (R17d), Bulb Housing Glass/Metal, Bulb Shape T12, Color Rendering Index 60, Color Temperature 4100K, Lumens 7,700 lm, Light Technology Fluorescent, Nominal Length 7 ft, Shatter-Resistant No, Watts 100 W, Voltage Ballast Dependent, Standards Meets 2012 Lighting Legislation Energy Standards, Bulb Minimum Starting Temperature -20 Degrees F, Bulb Start Type Rapid, High Output Yes, Overall Length 84 in, Rated Life 12,000 hr