Fluorescent Lamp, FB40T12/41K/9/U6/RS/G13/STD, 40 W, 2-Pin Medium G13 Lamp Base, T12 U-Bent, 2500 lm, 24000 hr Average Life, 90 CRI, 4100 K Color, Rapid Start, Tri-Phosphor Coated, 1-1/2 in Dia x 22-1/2 in L, 10 deg C Minimum Starting, 60 Hz Operating Frequency, Cool White Light