Linear Fluorescent Bulb Bulb Base Type Medium Bi-Pin (G13) Bulb Housing Glass/Metal Bulb Shape T12 Color Rendering Index 87 Color Temperature 4100K Lumens 2 500 lm Light Technology Fluorescent Nominal Length 4 ft Shatter-Resistant No Watts 34 W Voltage Ballast Dependent Standards TCLP Compliant Bulb Minimum Starting Temperature 59 Degrees F Bulb Start Type Rapid High Output No Overall Length 48 in Rated Life 20 000 hr Bulb Power Source Requires Separate Ballast