Philips Lighting ALTO® Fluorescent Lamp, Energy Advantage High Output, Series: 800, F54T5/841/HO/EA/ALTO 49W 40/1, 49 W, Linear Fluorescent Lamp, Bi-Pin G5 Miniature Lamp Base, T5, 4800 Lumens, 25000 to 35000 hr Average Life, Cool White, 82 CRI, 4100 K Color, Opaque Lamp, Programmed Start, 5/8 in Dia x 46 in L