Linear Fluorescent Bulb, Bulb Base Type Recessed Double Contact (R17d), Bulb Shape T12, Color Rendering Index 60, Color Temperature 4100K, Lumens 2,440 lm, Light Technology Fluorescent, Nominal Length 3 ft, Shatter-Resistant No, Watts 50 W, Voltage Ballast Dependent, Standards Meets 2012 Lighting Legislation Energy Standards, ANSI Code 1012-1, Bulb Minimum Starting Temperature -20 Degrees F, Bulb Start Type Rapid, High Output Yes, Overall Length 33 3/4 in, Rated Life 9,000 hr