Fluorescent Lamp, FC8T9/DL/RS/4P/STD, 22 W, G10q-4 Lamp Base, T9 Circline, 1210 lm, 10000 hr Average Life, 82 CRI, 6500 K Color, Rapid Start, Daylight Delux/Tri-Phosphor Coated, 1-3/16 in Dia x 8 in W, 14 deg F Minimum Starting, 60 Hz Operating Frequency, 55 lm/W Efficacy