Fluorescent Lamp, FC8T9/CW/RS/4P/STD, 22 W, G10q-4 Lamp Base, T9 Circline, 1350 lm, 10000 hr Average Life, 82 CRI, 4100 K Color, Rapid Start, Cool White/Tri-Phosphor Coated, 1-3/16 in Dia x 8 in W, 14 deg F Minimum Starting, 60 Hz Operating Frequency, 61 lm/W Efficacy