(12 Pack) Sylvania 24004 - FB40/CWX/6 U Shaped T12 Fluorescent Tube Light Bulb Fluorescent bulbs are energy saving bulbs and last up to 10 times longer than incandescent bulbs Fluorescent bulbs help you save money using 40 - 70% less energy than incandescent bulbs Fluorescent bulbs are 5-8 times more brighter (more output lumens /watt) than incandescent bulbs Sylvania U-Tube fluorescent bulb, 40W, Base: G13 2-Pin, Color Temp: 4100K, Rated Life (hours): 18000