4 Qty. Halco F17 T8 4100K 78CRI ECO ProLume F17T8/741/ECO 17w Linear Fluorescent Rapid Start 741 Phosphor Lamp Bulb 17 Watts - 4100K Color Temperature Bulb Base : G13 Bulb Shape : F17T8 Linear Fluorescent Average Life (Hours) : 24,000 Length (In.) : 24 - Tube Diameter (In.) : 1