Linear Fluorescent Bulb Bulb Base Type Recessed Double Contact (R17d) Bulb Housing Glass Bulb Shape T8 Color Rendering Index 86 Color Temperature 4100K Lumens 4 000 lm Light Technology Fluorescent Nominal Length 4 ft Shatter-Resistant No Watts 44 W Voltage Ballast Dependent Standards UL Listed Bulb Minimum Starting Temperature 50 Degrees F High Output Yes Overall Length 48 in Rated Life 18 000 hr Bulb Power Source Requires Separate Ballast Trade Number F48T8/TL841/HO ALTO