Shat-R-Shield® Fluorescent Lamp, Straight, F20T12 CW/ALTO (PK X 30), 20 W, Linear Fluorescent Lamp, Bi-Pin G13 Medium Lamp Base, T12, 1200 Lumens, 11000 hr Average Life, Cool White, 62 CRI, 4100 K Color, Copolymer Coated Lamp, 1-1/2 in Dia x 24 in L