10 Qty. Halco F8 T5 Cool White ProLume F8T5CW 8w Linear Fluorescent Preheat Cool White Lamp Bulb 8 Watts - 4100K Color Temperature Bulb Base : G5 Bulb Shape : F4T5 Linear Fluorescent Average Life (Hours) : 6,000 Length (In.) : 12 - Tube Diameter (In.) : 0.63